A101329 2^(2^(2^x)+1)-1 = M(F(x)) == Mersenne(Fermat(x))

7, 31, 131071, 231584178474632390847141970017375815706539969331281128078915168015826259279871

Offset

0,1

Comments

Mersenne-Fermat numbers.

Links

Table of n, a(n) for n=0..3.

Formula

a(n) = A070969(2^n)-2. - R. J. Mathar, Apr 22 2007

Example

M(F(0))=7
M(F(1))=31
M(F(2))=131071
M(F(3))=231584178474632390847141970017375815706539969331281128078915168015826259279871

Prog

(PARI) for(x=0, 3, print(2^(2^(2^x)+1)-1))

Crossrefs

Sequence in context: A139314 A290969 A163083 * A193637 A214490 A360261

Adjacent sequences: A101326 A101327 A101328 * A101330 A101331 A101332

Keyword

nonn

Author

Jorge Coveiro, Dec 24 2004

Status

approved