A134709 Even superperfect numbers divided by 2, minus 1.

0, 1, 7, 31, 2047, 32767, 131071, 536870911, 576460752303423487, 154742504910672534362390527, 40564819207303340847894502572031, 42535295865117307932921825928971026431

Offset

1,3

Links

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

Formula

a(n) = (A061652(n)/2) - 1.

Example

a(5)=2047 because the 5th even superperfect number is 4096 and (4096/2)-1=2047.

Crossrefs

Cf. A019279, A061652, A133028.

Sequence in context: A280038 A253640 A191297 * A139314 A290969 A163083

Adjacent sequences: A134706 A134707 A134708 * A134710 A134711 A134712

Keyword

nonn

Author

Omar E. Pol, Nov 07 2007

Extensions

More terms from Jinyuan Wang, Mar 14 2020

Status

approved