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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. 2
77385, 87675, 320775, 329175, 509355, 1137045, 1447110, 2623005, 3310965, 3974880, 4095000, 4339335, 5183220, 6163815, 6975780, 9080190, 9462285, 10957170, 11139975, 11148900, 12382755, 12796140, 15514695, 15917580 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 5 04:13 EST 2020. Contains 338943 sequences. (Running on oeis4.)