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A119564 Define F(n) = 2^(2^n)+1 = n-th Fermat number, M(n) = 2^n-1 = the n-th Mersenne number. Then a(n) = F(n)-M(n)-1 = 2^(2^n) - 2^n + 1. 2
2, 3, 13, 249, 65521, 4294967265, 18446744073709551553, 340282366920938463463374607431768211329, 115792089237316195423570985008687907853269984665640564039457584007913129639681 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

EXAMPLE

F(2) = 2^(2^2)+1 = 17, M(2) = 2^2-1 = 3, F(2)-M(2)-1 = 13.

PROG

(PARI) fm4(n) = for(x=0, n, y=2^(2^x)+1-(2^x-1)-1; print1(y", "))

CROSSREFS

Cf. A119550, A119563.

Sequence in context: A132535 A056806 A270403 * A132358 A090100 A270314

Adjacent sequences:  A119561 A119562 A119563 * A119565 A119566 A119567

KEYWORD

nonn

AUTHOR

Cino Hilliard, May 31 2006

EXTENSIONS

Edited by N. J. A. Sloane, Jun 03 2006

Definition corrected by R. J. Mathar, May 15 2007

STATUS

approved

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Last modified May 14 10:15 EDT 2021. Contains 343880 sequences. (Running on oeis4.)