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
Examples
a(2) = 203 as 203 has 4 = 2*2 divisors and 202 and 204 are both balanced. - _David A. Corneth_, Apr 26 2022
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
Extensions
a(4)-a(6) from R. J. Mathar, Jun 24 2011
a(7)-a(10) from David A. Corneth, Apr 26 2022