OFFSET
1,2
COMMENTS
Also, numbers k such that k divides s(k), where s(1)=1, s(j) = s(j-1) + j*25^(j-1).
Equivalently, numbers k that divide ((24*k - 1)*25^k + 1) / 24^2 (cf. A014943).
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
select(t -> 25 &^ t - 1 mod t = 0, [seq(i, i=1..10^4, 2)]); # Robert Israel, Oct 04 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Edited by Max Alekseyev, Nov 16 2019
STATUS
approved