The book is now available! 7523
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ The largest prime that contains only distinct prime digits. [Poo Sung and Beedassy]

+ The only derangement of the prime 2357 that is an emirp. Note that the concatenation of both primes (23577523) and their reversals (75323257) forms other primes. [Beedassy]

+ The largest left-truncatable prime that contains only distinct prime digits. [Patterson]

+ 5*7*13*19 - 2*3*11*17 = 7523, written with the first consecutive primes on the left of the equation and a prime (emirp) with only prime digits on the right. [Capelle]

+ The smallest Honaker prime with all the prime digits: 7523 is the 953rd prime and 7 + 5 + 2 + 3 = 9 + 5 + 3. Note that the latter sum 17 and the concatenation 7523953 are also primes, as are the reversals 3257, 359, 71. [Beedassy]

+ The only balanced prime containing all distinct prime digits. [Loungrides]

+ There is only one prime of form (7x+5)/(2x+3). [Loungrides]

(There are 3 curios for this number that have not yet been approved by an editor.)

Prime Curios! © 2000-2018 (all rights reserved)  privacy statement