 1213 (another Prime Pages' Curiosity) Curios: Curios Search:   Participate:  GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits) The smallest four-digit prime (emirp) containing consecutive numbers (12 and 13). [Das] 12 and 13 are relatively prime, while 12^2 + 13^2 = 313 (a palindromic prime). Note also that 12^4 + 13^4 = 49297 is prime. [La Haye] The smallest of eight consecutive emirps. [Punches] The smallest emirp whose product of digits is a perfect number. [Loungrides] The only emirp concatenated from two double-digit numbers that are sides in an equable triangle, i.e., (5, 12, 13). (A shape is called equable if its area equals the perimeter). [Loungrides] Only non-titanic emirp, that is the product of a repunit number and all its truncations minus eight, i.e., 111*11*1-8. [Gupta] (There are 3 curios for this number that have not yet been approved by an editor.) Prime Curios! © 2000-2019 (all rights reserved)  privacy statement   (This page was generated in 0.0269 seconds.)