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A261537 Primes p such that p^7 + 2 is also prime. 2
53, 449, 521, 653, 881, 983, 1031, 1451, 1571, 1733, 1889, 2129, 2729, 3191, 4259, 5879, 6173, 7499, 7829, 8861, 9743, 9923, 10271, 10313, 11423, 11903, 12041, 12149, 12263, 12329, 12641, 12893, 14591, 14723, 14771, 14813, 15401, 16493, 17783, 18713, 19259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of primes of A216980. - Michel Marcus, Aug 24 2015

LINKS

Table of n, a(n) for n=1..41.

EXAMPLE

53^7 + 2 = 1174711139839 is a prime.

MAPLE

A261537:=n->`if`(isprime(n) and isprime(n^7+2), n, NULL): seq(A261537(n), n=1..5*10^4); # Wesley Ivan Hurt, Apr 14 2017

MATHEMATICA

Select[Prime[Range[2500]], PrimeQ[#^7 + 2] &]

PROG

(MAGMA) [p: p in PrimesUpTo(20000) | IsPrime(p^7+2)];

(PARI)  first(m)=my(v=vector(m)); i=1; for(j=1, m, while(!isprime((prime(i)^7)+2), i++); v[j]=prime(i); i++); v; \\ Anders Hellström, Aug 24 2015

CROSSREFS

Cf. A000040, A216980.

Subsequence of A007528.

Cf. similar sequences listed in A261536.

Sequence in context: A185239 A053736 A181968 * A142209 A322043 A293089

Adjacent sequences:  A261534 A261535 A261536 * A261538 A261539 A261540

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Aug 24 2015

STATUS

approved

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Last modified January 17 09:32 EST 2020. Contains 330949 sequences. (Running on oeis4.)