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A224467 Numbers n such that 27*n+1 is prime. 2
4, 6, 10, 14, 16, 18, 20, 28, 30, 34, 48, 54, 58, 60, 66, 74, 76, 80, 84, 88, 94, 96, 98, 108, 110, 114, 118, 128, 130, 136, 138, 144, 146, 150, 154, 166, 170, 180, 184, 186, 188, 198, 206, 214, 230, 236, 238, 240, 258, 264, 268, 278, 280, 284, 286, 296, 300 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

K. D. Bajpai, Table of n, a(n) for n = 1..5736

EXAMPLE

27*6 + 1 = 163 which is prime. Hence 6 is in the sequence.

MAPLE

isA224467 := proc(n)

    isprime(27*n+1) ;

end proc:

for n from 1 to 300 do

    if isA224467(n) then

        printf("%d, ", n) ;

    end if;

end do: # R. J. Mathar, Jul 20 2013

MATHEMATICA

Select[Range[300], PrimeQ[27#+1]&] (* Harvey P. Dale, Apr 14 2017 *)

PROG

(PARI) is(n)=isprime(27*n+1) \\ Charles R Greathouse IV, Jun 06 2017

CROSSREFS

Cf. A005123, A024906.

Sequence in context: A300912 A175706 A110507 * A134624 A171945 A310583

Adjacent sequences:  A224464 A224465 A224466 * A224468 A224469 A224470

KEYWORD

nonn,easy

AUTHOR

K. D. Bajpai, Jul 20 2013

STATUS

approved

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Last modified December 1 09:28 EST 2020. Contains 338833 sequences. (Running on oeis4.)