OFFSET
1,2
COMMENTS
A005188 is a subsequence of this sequence.
Numbers in A007088 with either 3 or 9 ones are terms of this sequence. - Chai Wah Wu, Feb 26 2019
For all N in A007088 we have A101337(N) = A007953(N) = number of digits '1'; whenever this equals 2^k*5^m (k, m >= 0) and N ends in max(k,m) '0's, then N is also in this sequence. - M. F. Hasler, Nov 18 2019
EXAMPLE
For k = 20, 20 / (2^2 + 0^2) = 5;
for k = 221, 221 / (2^3 + 2^3 + 1^3) = 13.
PROG
(PARI) isok(n) = frac(n/A101337(n)) == 0; \\ Michel Marcus, Feb 11 2019
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Ctibor O. Zizka, Feb 10 2019
STATUS
approved