A325439 Indices of primes of the form k^2 + 1 ending in 7.

3, 4, 6, 7, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 23, 24, 26, 27, 29, 32, 34, 35, 36, 38, 40, 43, 45, 48, 50, 51, 52, 55, 56, 57, 59, 62, 64, 65, 66, 68, 70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 81, 82, 83, 85, 87, 89, 90, 91, 95, 97, 98, 99, 101, 103, 107

Offset

1,1

Comments

This sequence is presumably infinite. See 1st comment of A002496.

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Formula

A002496(a(n)) mod 10 = 7.

Maple

P:=[seq(k mod 10, k=select(isprime, [2, seq(4*i^2+1, i=1..10000)]))]:
seq(`if`(P[i] mod 10 = 7, i, NULL), i=1..nops(P));

Crossrefs

Cf. A002496, A325437, A325438.

Sequence in context: A320300 A070762 A061208 * A183860 A298109 A184429

Adjacent sequences: A325436 A325437 A325438 * A325440 A325441 A325442

Keyword

nonn,base

Author

Martin Renner, Apr 27 2019

Status

approved