A124487 Numbers k such that 2*k-1, 4*k-1, 6*k-1 and 8*k-1 are primes.

3, 45, 705, 945, 5295, 5775, 5955, 6450, 8580, 9945, 11175, 12120, 13095, 18000, 18525, 18690, 19710, 22440, 22785, 24960, 30390, 33780, 34335, 37665, 41790, 44460, 52185, 54180, 56175, 57300, 63570, 66990, 67515, 67725, 73335, 74700

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[80000], And @@ PrimeQ /@ ({2, 4, 6, 8}*# - 1) &] (* Ray Chandler, Nov 21 2006 *)

Crossrefs

Cf. A124485-A124492.

Sequence in context: A076140 A131568 A287031 * A266698 A132303 A298799

Adjacent sequences: A124484 A124485 A124486 * A124488 A124489 A124490

Keyword

nonn

Author

Artur Jasinski, Nov 04 2006

Extensions

Extended by Ray Chandler, Nov 21 2006

Status

approved