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A134709 Even superperfect numbers divided by 2, minus 1. 1
0, 1, 7, 31, 2047, 32767, 131071, 536870911, 576460752303423487, 154742504910672534362390527, 40564819207303340847894502572031, 42535295865117307932921825928971026431 (list; graph; refs; listen; history; text; internal format)
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

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Last modified March 4 14:44 EST 2021. Contains 341796 sequences. (Running on oeis4.)