A204904 p(n)-q(n), where (p(n), q(n)) is the least pair of odd primes for which n divides p(n)-q(n).

2, 2, 6, 4, 10, 6, 14, 8, 18, 10, 22, 12, 26, 14, 30, 16, 34, 18, 38, 20, 42, 22, 46, 24, 50, 26, 54, 28, 58, 30, 62, 32, 66, 34, 70, 36, 74, 38, 78, 40, 82, 42, 86, 44, 90, 46, 94, 48, 98, 50, 102, 52, 106, 54, 110, 56, 114, 58, 118, 60, 122, 62, 126, 64, 130

Offset: 1

Author

Clark Kimberling, Jan 20 2012

Keywords

• nonn

Comments

This sequence agrees with A109043 for 0

For a guide to related sequences, see A204892.

Sequence agrees with A109043 at least up to 6400. - Michel Marcus, Mar 14 2018

If Polignac's conjecture is true, then this is a duplicate of A109043. - Robert Israel, Mar 14 2018

Examples

			1 = (5-3)/2=(7-3)/4=(13-3)/6=(11-3)/8=...
2 = (5-3)/1=(11-5)/3=(7-3)/5=(17-3)/7=...
		

Links

• Wikipedia, Polignac's conjecture

Crossrefs

Cf. A066043, A109043, A204900, A204892, A210530.

Programs

Mathematica

(See the program at A204900.)

PARI

a(n) = {forprime(p=5,,forprime(q=3, p-1, d = p-q; if ((d % n) == 0, return (d));););} \\ Michel Marcus, Mar 14 2018

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