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Here is a frequently
asked question at the Prime Pages :
I am working on an algorithm and need a few of the largest primes
with 64 bits. Where can I find them?
To which we answer "here!" Below, for each consecutive value of n
we give the ten least positive integers k such that 2n k
is a prime. In each case these are proven primes (proven using UBASIC 's
APRT-CL ). Note that 2n k
will be an n bit number (for these k 's).
Pages: 8-100 bits , 101-200
bits , 201-300 bits , 301-400 bits .
n ten least k 's for which 2n k is
prime.
201
55, 111, 313, 381, 385, 439, 481, 663, 679, 865
202
183, 195, 273, 585, 845, 977, 1043, 1067, 1161, 1355
203
159, 187, 237, 271, 495, 741, 829, 931, 957, 1101
204
167, 249, 857, 1125, 1137, 1169, 1487, 1515, 1683, 1815
205
81, 229, 325, 343, 369, 441, 753, 825, 969, 1089
206
5, 63, 261, 297, 393, 497, 567, 813, 885, 1017
207
91, 157, 297, 369, 387, 429, 459, 481, 517, 871
208
299, 423, 563, 675, 1383, 1505, 1583, 1593, 1695, 1749
209
33, 273, 301, 321, 439, 451, 493, 735, 873, 885
210
47, 65, 165, 171, 203, 213, 503, 555, 741, 755
211
175, 481, 495, 601, 837, 1099, 1281, 1329, 1357, 1917
212
23, 29, 99, 149, 357, 413, 479, 497, 533, 695
213
3, 61, 123, 513, 595, 793, 1315, 1329, 1335, 1683
214
185, 255, 395, 447, 623, 633, 707, 743, 813, 1035
215
157, 237, 309, 765, 897, 1081, 1147, 1189, 1377, 1477
216
377, 479, 683, 707, 843, 1167, 1215, 1253, 1343, 1377
217
61, 229, 369, 441, 519, 675, 729, 811, 999, 1033
218
33, 117, 233, 243, 257, 275, 297, 341, 623, 747
219
121, 261, 277, 355, 397, 471, 615, 685, 1105, 1189
220
77, 167, 395, 473, 483, 585, 587, 609, 923, 963
221
3, 133, 309, 373, 411, 573, 759, 855, 979, 999
222
117, 263, 335, 437, 641, 647, 875, 1035, 1103, 1125
223
235, 259, 549, 715, 777, 1125, 1221, 1225, 1417, 1621
224
63, 363, 573, 719, 773, 857, 1025, 1223, 1227, 1253
225
49, 81, 103, 261, 445, 489, 609, 625, 741, 825
226
5, 77, 155, 203, 215, 417, 533, 573, 767, 833
227
405, 441, 625, 721, 835, 855, 1017, 1149, 1479, 1507
228
93, 149, 185, 455, 537, 549, 723, 899, 1209, 1283
229
91, 291, 475, 531, 565, 685, 733, 775, 939, 1093
230
27, 77, 345, 351, 831, 917, 1221, 1245, 1247, 1335
231
165, 217, 235, 249, 345, 391, 399, 439, 481, 559
232
567, 665, 833, 875, 1163, 1197, 1253, 1403, 1917, 2097
233
3, 159, 289, 373, 511, 531, 595, 615, 759, 1113
234
83, 243, 257, 341, 503, 581, 593, 683, 1157, 1803
235
15, 151, 181, 259, 451, 537, 561, 679, 727, 1167
236
209, 455, 513, 569, 657, 875, 915, 1203, 1317, 1349
237
181, 649, 765, 829, 949, 1449, 1515, 1633, 1689, 1711
238
161, 215, 383, 425, 665, 731, 791, 825, 1263, 1313
239
87, 199, 421, 531, 939, 1147, 1395, 1701, 2001, 2187
240
467, 797, 887, 1493, 1529, 2027, 2093, 2253, 2495, 2589
241
39, 819, 1383, 2065, 2113, 2133, 2215, 2253, 2295, 2505
242
63, 267, 281, 527, 777, 945, 971, 1077, 1223, 1487
243
9, 31, 199, 475, 507, 699, 1117, 1125, 1179, 1417
244
189, 329, 767, 1065, 1289, 1553, 1565, 1923, 2105, 2505
245
163, 303, 489, 759, 843, 861, 1039, 1321, 1389, 1413
246
107, 171, 243, 483, 567, 797, 945, 1155, 1617, 1697
247
81, 309, 361, 411, 525, 571, 729, 939, 1047, 1149
248
237, 387, 485, 603, 605, 765, 887, 1097, 1223, 1515
249
75, 279, 385, 403, 531, 583, 595, 693, 999, 1021
250
207, 407, 1053, 1391, 1655, 1671, 1785, 1793, 2111, 2327
251
9, 325, 355, 369, 451, 465, 615, 619, 1141, 1339
252
129, 143, 413, 549, 705, 749, 839, 1077, 1133, 1175
253
273, 391, 421, 1615, 1723, 1725, 1791, 1879, 1951, 2091
254
245, 521, 701, 933, 941, 1223, 1311, 1427, 1491, 1527
255
19, 31, 475, 735, 765, 921, 949, 1285, 1311, 1351
256
189, 357, 435, 587, 617, 923, 1053, 1299, 1539, 1883
257
93, 363, 493, 679, 813, 819, 1861, 2113, 2211, 2233
258
87, 1017, 1203, 1355, 1385, 1547, 1773, 2411, 2415, 2747
259
361, 417, 561, 745, 885, 987, 1069, 1071, 1159, 1305
260
149, 597, 687, 689, 803, 983, 995, 1247, 1373, 1419
261
223, 261, 361, 609, 1251, 1263, 1629, 1791, 2023, 2095
262
71, 287, 453, 515, 711, 1013, 1127, 1187, 1365, 1415
263
747, 819, 939, 1017, 1101, 1297, 1665, 1767, 2337, 2679
264
275, 363, 567, 1245, 1257, 1355, 1419, 1505, 1635, 2013
265
49, 115, 139, 211, 489, 601, 1063, 1281, 1285, 1399
266
3, 213, 365, 1115, 1611, 1851, 2171, 2177, 2273, 2477
267
265, 427, 481, 517, 555, 595, 1099, 1381, 1449, 1797
268
77, 329, 719, 825, 1305, 1635, 1749, 2009, 2259, 2273
269
241, 343, 603, 615, 709, 1155, 1281, 1431, 1713, 1759
270
53, 611, 1071, 1251, 1397, 1691, 1847, 1853, 2133, 2343
271
169, 441, 967, 1221, 1419, 2289, 2295, 2617, 2775, 2817
272
237, 287, 689, 905, 1253, 1443, 2159, 2355, 2367, 2397
273
205, 321, 345, 795, 963, 1101, 1269, 1321, 1329, 1725
274
305, 351, 707, 785, 801, 843, 1077, 1263, 1793, 1833
275
129, 199, 205, 651, 721, 939, 999, 1017, 1051, 1629
276
89, 453, 473, 483, 609, 675, 915, 1133, 1287, 1295
277
103, 181, 859, 1221, 1603, 2071, 2115, 2289, 2343, 2409
278
93, 623, 653, 665, 831, 857, 947, 1493, 1553, 1563
279
69, 231, 535, 751, 781, 1159, 1509, 1629, 1839, 2035
280
47, 105, 195, 725, 1077, 1415, 2105, 2199, 2805, 3029
281
139, 259, 601, 615, 633, 663, 729, 853, 931, 1195
282
83, 93, 237, 245, 425, 443, 503, 557, 647, 1431
283
45, 1225, 1239, 1431, 1455, 1615, 2107, 2355, 2485, 2667
284
173, 323, 2009, 2109, 2159, 2333, 2417, 3045, 3227, 3713
285
9, 33, 735, 1081, 1243, 1641, 1839, 1879, 1965, 2245
286
165, 521, 533, 593, 617, 915, 983, 1265, 1433, 1797
287
115, 435, 771, 835, 937, 951, 1401, 1441, 1759, 1861
288
167, 525, 567, 1355, 1473, 1595, 1875, 2349, 2537, 2765
289
493, 843, 945, 1383, 1489, 1621, 2083, 2143, 2575, 2649
290
47, 83, 503, 825, 1221, 1553, 1587, 1641, 1697, 1791
291
19, 315, 427, 861, 907, 987, 1017, 1195, 1329, 2085
292
167, 197, 207, 657, 789, 923, 977, 1623, 1655, 1967
293
601, 1095, 1389, 1455, 1459, 1693, 1849, 1863, 2071, 2163
294
35, 135, 177, 245, 315, 515, 633, 917, 1047, 1125
295
171, 421, 459, 511, 585, 1291, 1461, 1579, 1611, 2077
296
285, 785, 1007, 1287, 1389, 1709, 1727, 2117, 2295, 2477
297
123, 171, 285, 333, 619, 693, 703, 859, 1273, 1501
298
341, 483, 953, 1223, 1251, 1307, 1475, 1805, 1845, 1907
299
69, 405, 429, 675, 1015, 1017, 1105, 1137, 1167, 1539
300
153, 185, 383, 413, 483, 539, 693, 779, 1047, 1097
