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A378134
a(n) is the smallest prime p such that (2*p)^(2^n) + 1 is also prime.
3
2, 2, 2, 2, 37, 281, 137, 2129, 139, 23, 1231, 1279, 17477
OFFSET
0,1
CROSSREFS
Primes p such that (2*p)^(2^k) + 1 is prime: A005384 (k = 0), A052291 (k = 1), A378146 (k = 2).
If a(n) is the smallest prime number p such that (p*2^m)^(2^n) + 1, then we have:
2, 2, 2, 2, 2 (in case m = 0), where primes of the form (p*2^0)^(2^n)+1 are A019434;
this sequence (in case m = 1).
Cf. A378143.
Sequence in context: A286851 A320017 A289087 * A154288 A225057 A084954
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(11)-a(12) from Michael S. Branicky, Nov 18 2024
STATUS
approved