A306951 Number of weird numbers (A006037) below 10^n.

0, 1, 2, 7, 204, 1765, 15554, 173709, 1756426, 17270452, 172559761

Offset

1,3

Comments

Benkoski and Erdős proved that the asymptotic density of weird numbers is positive, thus lim_{n->oo} a(n)/10^n = c > 0. Is c = 0.0017...?

Links

Table of n, a(n) for n=1..11.

S. J. Benkoski and P. Erdős, On weird and pseudoperfect numbers, Math. Comp., 28 (1974), pp. 617-623. Alternate link; 1975 corrigendum.

Example

The only weird number below 100 is 70 which is larger than 10, thus a(1) = 0 and a(2) = 1.

Crossrefs

Cf. A006037, A275487, A275491, A302992.

Sequence in context: A125610 A247028 A333740 * A181864 A096463 A048560

Adjacent sequences: A306948 A306949 A306950 * A306952 A306953 A306954

Keyword

nonn,more

Author

Amiram Eldar, Mar 17 2019

Extensions

a(11) from Amiram Eldar, May 26 2023

Status

approved