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A074855 Primes p such that all p-t for p/2 < t < p are composite, where t is a triangular number. 0

%I #8 Dec 15 2017 17:36:04

%S 2,3,7,19,29,37,61,211,521,613,1579,2131,2467,2551,3331

%N Primes p such that all p-t for p/2 < t < p are composite, where t is a triangular number.

%C Next term, if it exists, is greater than 15900000. (Is this sequence finite?) - _Ryan Propper_, May 20 2006

%e 29 is in the sequence because the triangular numbers between 14 and 29 are 15, 21, 28 and 29-15 = 14, 29-21 = 8, 29-28 = 1 are all composite.

%K more,nonn

%O 1,1

%A _Jason Earls_, Sep 11 2002

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Last modified July 16 08:10 EDT 2024. Contains 374345 sequences. (Running on oeis4.)