A139567 Bisection of ultraperfect numbers A139306.

8, 512, 33554432, 137438953472, 2658455991569831745807614120560689152

Offset: 1

Author

Omar E. Pol, May 08 2008

Keywords

• nonn

Links

• Jinyuan Wang, Table of n, a(n) for n = 1..8

Crossrefs

Cf. A099057, A099058, A139306, A139563, A139564, A139568.

Formula

a(n) = A139306(2*n-1). - Jinyuan Wang, Mar 14 2020