A120222 Numbers n such that a+n and a*n+1 are prime, case a=6.

1, 5, 7, 11, 13, 17, 23, 25, 35, 37, 47, 55, 61, 73, 77, 83, 91, 95, 101, 103, 107, 121, 125, 131, 143, 151, 161, 173, 175, 187, 205, 217, 221, 233, 245, 257, 263, 271, 277, 287, 305, 311, 325, 331, 347, 367, 373, 391, 395, 425, 443, 451, 455, 461, 481, 503, 551

Offset

1,2

Comments

All terms == 1 or 5 (mod 6). - Robert Israel, Oct 29 2020

Links

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

Maple

select(n -> isprime(n+6) and isprime(6*n+1), [seq(i, i=1..1000, 2)]); # Robert Israel, Oct 29 2020

Crossrefs

Case a=4 A120226, a=5 A120227, a=8 A120228.

Prime numbers p such that a+p and a*p+1 are prime A106057-A106066.

Sequence in context: A262084 A086304 A193947 * A054794 A104860 A216751

Adjacent sequences: A120219 A120220 A120221 * A120223 A120224 A120225

Keyword

nonn

Author

Zak Seidov, Jun 10 2006

Status

approved