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A124408 Numbers n such that 2n+1, 4n+1 and 6n+1 are primes. 5
1, 3, 18, 105, 135, 153, 165, 168, 300, 363, 585, 618, 648, 765, 828, 1110, 1140, 1278, 1518, 1530, 1533, 2130, 2223, 2400, 2475, 2613, 2790, 2925, 3075, 3180, 3345, 3420, 3483, 3810, 3840, 3843, 3933, 4008, 4083, 4095, 4143, 4260, 4263, 4323, 4470, 4545 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

Select[Range[4600], And @@ PrimeQ /@ ({2, 4, 6}*# + 1) &] (*Chandler*)

CROSSREFS

Cf. A005097, A005098, A024899, A123998, A124409-A124411, A071576.

Sequence in context: A180036 A038158 A009021 * A136779 A106328 A007277

Adjacent sequences:  A124405 A124406 A124407 * A124409 A124410 A124411

KEYWORD

nonn

AUTHOR

Artur Jasinski grafixATcsl.pl, Oct 31 2006

STATUS

approved

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Last modified August 20 13:04 EDT 2017. Contains 290835 sequences.