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

7, 31, 131071, 231584178474632390847141970017375815706539969331281128078915168015826259279871

Offset: 0

Author

Jorge Coveiro, Dec 24 2004

Keywords

• nonn

Comments

Mersenne-Fermat numbers.

Examples

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

Programs

PARI

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

Formula

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