A206554 Numbers n such that 2^n + 41*2^floor((n+1)/2) - 1 is prime.

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

Links

Table of n, a(n) for n=1..36.

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

Adjacent sequences: A206551 A206552 A206553 * A206555 A206556 A206557

Keyword

nonn

Author

Pierre CAMI, Feb 09 2012

Status

approved