A124488 Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1 and 10*k-1 are primes.

3, 45, 6450, 18000, 22785, 41790, 54180, 77385, 87675, 98385, 103005, 104520, 151515, 187005, 210210, 244590, 256620, 320775, 329175, 354795, 382875, 387975, 431385, 495540, 509355, 528510, 632775, 763815, 804870, 810540, 812175, 849285

Offset

1,1

Links

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

Mathematica

Select[Range[900000], And @@ PrimeQ /@ ({2, 4, 6, 8, 10}*# - 1) &] (* Ray Chandler, Nov 21 2006 *)

Crossrefs

Cf. A124485-A124492.

Sequence in context: A302156 A229415 A265621 * A086683 A155203 A183131

Adjacent sequences: A124485 A124486 A124487 * A124489 A124490 A124491

Keyword

nonn

Author

Artur Jasinski, Nov 04 2006

Status

approved