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A237418 Primes of the form 4^n + 15. 2
19, 31, 79, 271, 1039, 4111, 65551, 4194319, 67108879, 1073741839, 4294967311, 1099511627791, 4398046511119, 70368744177679, 4722366482869645213711, 75557863725914323419151 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A144487.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..26

MATHEMATICA

Select[Table[4^n + 15, {n, 1, 200}], PrimeQ]

PROG

(MAGMA) [a: n in [1..70] | IsPrime(a) where a is 4^n+15];

CROSSREFS

Cf. A144487.

Sequence in context: A106861 A107168 A243450 * A240126 A125602 A139847

Adjacent sequences:  A237415 A237416 A237417 * A237419 A237420 A237421

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 22 2014

STATUS

approved

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Last modified January 16 06:41 EST 2021. Contains 340204 sequences. (Running on oeis4.)