A339935 Primes p such that p+(p^2-1)/6 is a square.
5, 29, 73, 313, 71477281, 297316321, 271351716183549149, 645761700848255113, 233017713343294737292495403306881, 521760494347510297716737304478850311229
Offset: 1
Keywords
Examples
a(3)=73 is a term because 73 is prime and 73+(73^2-1)/6 = 961 = 31^2 is a square.
Links
- Robert Israel, Table of n, a(n) for n = 1..15
Programs
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Maple
f:= gfun:-rectoproc({a(i+4)-10*a(i+2)+a(i)=24,a(0)=1,a(1)=1,a(2)=5,a(3)=29},a(i),remember): select(isprime, map(f, [$1..100]));
Comments