A285812 Primes equal to a centered 9-gonal number plus 1.

2, 11, 29, 137, 191, 821, 947, 2081, 2927, 3917, 5051, 6329, 11027, 13367, 14879, 15401, 17021, 17579, 21737, 22367, 24977, 36857, 39341, 43661, 47279, 50087, 58997, 62129, 66431, 70877, 95267, 96581, 106031, 113051, 117371, 129287, 130817, 135461, 156521

Offset

1,1

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(9, k) + 1), listput(L, p))); Vec(L)

Crossrefs

Cf. A000040, A060544, A285809, A285810, A285811.

Sequence in context: A106926 A220095 A133558 * A140745 A356567 A178629

Adjacent sequences: A285809 A285810 A285811 * A285813 A285814 A285815

Keyword

nonn

Author

Colin Barker, Apr 27 2017

Status

approved