1,1

Similar to the Woodall primes, A050918.

The next term in this sequence is unknown; if it is infinite, the next term is greater than 8000.

Table of n, a(n) for n=1..18.

5 = 2*2^2 - 3; 61 = 4*2^4 - 3; 157 = 5*2^5 - 3

#choose N large, then S is the desired set

f:=n->n*2^n - 3:

S:={}:

for n from 0 to N do if(isprime(f(n))) then S:=S union {n}: fi: od

Cf. A050918. Values for primes are A182352.

Sequence in context: A174513 A000063 A039574 * A295402 A121410 A002959

Adjacent sequences: A182372 A182373 A182374 * A182376 A182377 A182378

nonn

Patrick Devlin, Apr 26 2012

approved