A209294 -id:A209294

Search: a209294 -id:a209294

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A285811

Primes equal to a centered heptagonal number plus 1.

+10
4

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.

KEYWORD

nonn

AUTHOR

Colin Barker, Apr 27 2017

STATUS

approved

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