A195131 Numbers k such that 666k-1 is prime.

3, 4, 5, 10, 14, 17, 18, 19, 25, 27, 30, 33, 34, 38, 44, 49, 52, 54, 55, 59, 63, 67, 69, 70, 72, 80, 89, 94, 97, 98, 102, 103, 104, 105, 107, 110, 128, 130, 132, 135, 140, 149, 154, 157, 158, 163, 174, 175, 177, 185, 187, 188, 199, 203, 220, 223, 224, 228, 237, 238, 240, 245, 249, 257, 258, 262, 265, 268, 270, 279, 280, 287, 290, 292

Offset

1,1

Links

Table of n, a(n) for n=1..74.

C. Caldwell, 139·666^178851 - 1, Sep 08 2011

Example

a(1)=3 since 3*666-1 = 1997 = A063472(1) is prime, and the smallest prime to be of that form.
K=139*666^178850 is also a member of this sequence, since 139*666^178851-1 is prime (cf. link).

Prog

(PARI) for(k=1, 999, ispseudoprime(k*666-1)&print1(k", "))

Crossrefs

Cf. A063472, A037029, A037030.

Sequence in context: A240789 A396344 A191647 * A361666 A240793 A079351

Adjacent sequences: A195128 A195129 A195130 * A195132 A195133 A195134

Keyword

nonn

Author

M. F. Hasler, Sep 09 2011

Status

approved