A361009 Positive integers k such that 2*k cannot be expressed p^2-q where p and q are primes.

5, 8, 14, 17, 20, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 62, 65, 68, 71, 72, 74, 77, 80, 86, 89, 92, 95, 98, 101, 104, 107, 110, 113, 116, 119, 122, 125, 128, 131, 134, 137, 140, 146, 149, 152, 155, 158, 161, 164, 167, 170, 173, 176, 182, 185, 188, 191, 194, 197

Offset

1,1

Comments

Most of the terms are congruent to 1 mod 3, but some terms of A016789 are missing.

A few terms are divisible by 3 (A008585).

Links

Table of n, a(n) for n=1..60.

Crossrefs

Cf. A000040, A001248, A109619.

Cf. A008585, A016789.

Sequence in context: A314474 A314475 A020757 * A314476 A314477 A314478

Adjacent sequences: A361006 A361007 A361008 * A361010 A361011 A361012

Keyword

nonn

Author

Michel Marcus, Feb 28 2023

Status

approved