A191556 Largest k with 2n divisors such that the binary representations of k-1 and k+1 are in base 2 each digitally balanced with 4n digits.

11, 203, 3971, 64771, 1011875, 16752659, 267475203, 4294709251, 68715414027, 1099495919619

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Formula

a(n) = Max_{k: k in A191292, A000005(k)=2n, A070939(k-1)=A070939(k+1)=4*n}. - R. J. Mathar, Jun 24 2011

Example

a(2) = 203 as 203 has 4 = 2*2 divisors and 202 and 204 are both balanced. - David A. Corneth, Apr 26 2022

Crossrefs

Cf. A031443, A191292, A191369, A191534.

Cf. A000005, A070939.

Sequence in context: A268959 A213531 A064748 * A091814 A280957 A020518

Adjacent sequences: A191553 A191554 A191555 * A191557 A191558 A191559

Keyword

nonn,base,more

Author

Juri-Stepan Gerasimov, Jun 05 2011

Extensions

a(4)-a(6) from R. J. Mathar, Jun 24 2011

a(7)-a(10) from David A. Corneth, Apr 26 2022

Status

approved