A138600 Numbers n such that 2^(2*n-33)-33 is prime.

17, 21, 31, 55, 85, 91, 121, 159, 175, 379, 555, 769

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Example

2^(2*21-33)-33=479, 2^(2*31-33)-33=536870879, 2^(2*55-33)-33=151115727451828646838239, ...

Mathematica

q=33; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^3}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]

Prog

(PARI) is(n)=isprime(2^(2*n-33)-33) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A188200 A060875 A259555 * A050845 A219396 A125613

Adjacent sequences: A138597 A138598 A138599 * A138601 A138602 A138603

Keyword

nonn,easy

Author

Vladimir Joseph Stephan Orlovsky, May 13 2008

Status

approved