A124489 Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1, 10*k-1 and 12*k-1 are primes.

77385, 87675, 320775, 329175, 509355, 1137045, 1447110, 2623005, 3310965, 3974880, 4095000, 4339335, 5183220, 6163815, 6975780, 9080190, 9462285, 10957170, 11139975, 11148900, 12382755, 12796140, 15514695, 15917580

Offset

1,1

Links

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

Mathematica

Select[3*5*7*Range[160000], And @@ PrimeQ /@ ({2, 4, 6, 8, 10, 12}*# - 1) &] (* Ray Chandler, Nov 21 2006 *)
Select[Range[16*10^6], AllTrue[2*Range[6]#-1, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Apr 19 2019 *)

Crossrefs

Cf. A124485-A124492.

Sequence in context: A254453 A234418 A258543 * A215662 A183694 A206275

Adjacent sequences: A124486 A124487 A124488 * A124490 A124491 A124492

Keyword

nonn

Author

Artur Jasinski, Nov 04 2006

Status

approved