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A131210 Numbers n such that 24n - 1 is prime. 4
1, 2, 3, 7, 8, 10, 11, 13, 15, 16, 18, 20, 21, 25, 27, 30, 31, 35, 36, 37, 38, 41, 43, 46, 48, 51, 55, 57, 60, 62, 63, 65, 66, 67, 76, 77, 78, 85, 86, 87, 88, 92, 98, 100, 101, 102, 106, 108, 111, 112, 113, 120, 121, 122, 125, 126, 130, 132, 133, 140, 142, 147, 151, 153 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The complement is 4, 5, 6, 9, 12, 14, 17, 19, 22, 23, 24, ... and contains numbers of the form == 4 (mod 5), == 5 (mod 7), == 6 (mod 11), == 6 (mod 13), == 5 (mod 17) etc, so the complement is a superset of A182719. - R. J. Mathar, Jun 10 2020

LINKS

Muniru A Asiru, Table of n, a(n) for n = 1..5000

MAPLE

select(n->isprime(24*n-1), [$1..160]); # Muniru A Asiru, Feb 19 2018

PROG

(MAGMA) [n: n in [0..500]|IsPrime(24*n-1)] // Vincenzo Librandi, Nov 23 2010

(PARI) is(n)=isprime(24*n-1) \\ Charles R Greathouse IV, Jun 06 2017

(GAP) Filtered([1..160], n->IsPrime(24*n-1)); # Muniru A Asiru, Feb 19 2018

CROSSREFS

Sequence in context: A338691 A129341 A115985 * A088340 A288696 A163517

Adjacent sequences:  A131207 A131208 A131209 * A131211 A131212 A131213

KEYWORD

nonn,easy

AUTHOR

Zak Seidov, Oct 29 2007

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)