OFFSET
1,2
COMMENTS
Numbers which in base 8 contain only 0's and 1's, with equally spaced 1's. - Robert Israel, Jan 15 2019
LINKS
Robert Israel, Table of n, a(n) for n = 1..7932
T. Chinburg and M. Henriksen, Sums of k-th powers in the ring of polynomials with integer coefficients, Acta Arithmetica, 29 (1976), 227-250.
MAPLE
1, seq(seq((8^(k+r)-1)/(8^r-1), r = ListTools:-Reverse(sort(convert(numtheory:-divisors(k), list)))), k=1..20); # Robert Israel, Jan 15 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 06 2002
STATUS
approved