A134711 a(n) = n-th even superperfect number divided by 2^n, minus 1.

0, 0, 1, 3, 127, 1023, 2047, 4194303, 2251799813685247, 302231454903657293676543, 39614081257132168796771975167, 20769187434139310514121985316880383

Offset

1,4

Links

Jinyuan Wang, Table of n, a(n) for n = 1..18

Formula

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

Example

a(5) = 127 because the 5th even superperfect number is 4096 and 2^5 = 32 and (4096/32) - 1 = 127.

Crossrefs

Cf. A061652 (even superperfect numbers).

Sequence in context: A339084 A071151 A041867 * A376466 A163850 A258671

Adjacent sequences: A134708 A134709 A134710 * A134712 A134713 A134714

Keyword

nonn

Author

Omar E. Pol, Nov 07 2007

Extensions

Offset changed to 1 by and a(11)-a(12) from Jinyuan Wang, Mar 15 2020

Status

approved