The book is now available! 6
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

Single Curio View:   (Seek other curios for this number)


The start of a sequence of invertible semiprimes (numbers when inverted give a different semiprime): 6, 9, 106, 119, 611, 901, ... . Can you find the first case where both reversals are also different semiprimes? Dare we call them "bemirpimes" (short for bi-directional emirpimes)?


  Submitted: 2016-08-07 11:49:04;   Last Modified: 2016-08-07 20:57:00.

Prime Curios! © 2000-2017 (all rights reserved)