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

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.

Sequence in context: A073175 A352164 A141888 * A201851 A034523 A229222

Adjacent sequences: A285808 A285809 A285810 * A285812 A285813 A285814

Keyword

nonn

Author

Colin Barker, Apr 27 2017

Status

approved