A285811 - OEIS

A285811

Primes equal to a centered heptagonal number plus 1.

2, 23, 107, 149, 317, 1619, 2459, 3257, 3929, 5189, 6029, 6323, 7247, 15017, 19427, 21023, 21569, 26189, 42737, 45887, 55127, 56009, 63317, 66173, 67139, 70079, 82469, 101747, 105359, 110273, 125687, 136523, 137909, 149249, 155087, 159539, 167099, 171719

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Primes in A209294. - Omar E. Pol, Apr 27 2017

LINKS

Colin Barker, Table of n, a(n) for n = 1..1000

PROG

(PARI) cpg(m, n) = m*n*(n-1)/2+1 \\ n-th centered m-gonal number

maxk=600; L=List(); for(k=1, maxk, if(isprime(p=cpg(7, k) + 1), listput(L, p))); Vec(L)

CROSSREFS

Cf. A000040, A069099, A285809, A285810, A285812.