mersenneforum.org Two possible challenges
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 2013-10-23, 05:41 #1 devarajkandadai     May 2004 22×79 Posts Two possible challenges 1) This is with reference to the large prime: Id 116042 in the database pertaining to large primes. Q: Is this Sophie prime also a Mangammal prime? (for definition see A123239 ). 2) Are there infinitely many Shantha primes? ( see encyclopedia in planetmath.org ) A.K. Devaraj
 2013-11-09, 23:30 #2 MattcAnderson     "Matthew Anderson" Dec 2010 Oregon, USA 110410 Posts Hi man, I admire your contribution to the encyclopedia for integer sequences and to this forum. To quote oeis.org/A123239 Primes that do not divide 3^n-2 for any n. Cheers, Matt

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