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A092244
Numbers n such that 2^n-th prime + 2^(n-1)-th prime + 1 is prime.
0
11, 73, 443, 1031, 2339, 11833, 56737, 122891, 5423669
OFFSET
1,1
EXAMPLE
prime(2^2)+prime(2^1) + 1 = 11 = prime.
PROG
(PARI) f(n)= for(x=1, n, y=prime(2^x)+ prime(2^(x-1))+1; if(isprime(y), print1(y", ")))
CROSSREFS
Sequence in context: A226034 A217946 A163775 * A342830 A155634 A335828
KEYWORD
hard,nonn
AUTHOR
Cino Hilliard, Feb 20 2004
STATUS
approved