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A206554
Numbers n such that 2^n + 41*2^floor((n+1)/2) - 1 is prime.
1
1, 4, 5, 8, 9, 12, 16, 17, 33, 61, 92, 113, 137, 216, 237, 833, 872, 948, 1308, 1728, 2509, 4096, 5457, 6229, 6432, 6473, 6868, 7032, 8128, 8557, 10449, 11022, 15629, 29217, 40756, 60684
OFFSET
1,2
COMMENTS
All certified primes
PROG
(PARI) is(n)=ispseudoprime(2^n + 41<<((n+1)\2) - 1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Cf. A206553.
Sequence in context: A269984 A188085 A316097 * A267489 A073320 A020668
KEYWORD
nonn
AUTHOR
Pierre CAMI, Feb 09 2012
STATUS
approved