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A014962 Odd numbers k that divide 25^k - 1. 1
1, 3, 9, 21, 27, 63, 81, 93, 147, 171, 189, 243, 279, 441, 513, 567, 609, 651, 729, 837, 903, 1029, 1197, 1323, 1539, 1701, 1827, 1953, 2187, 2511, 2667, 2709, 2883, 2943, 3087, 3249, 3591, 3969, 4263, 4401, 4557, 4617, 5103, 5301, 5481, 5859, 6321 (list; graph; refs; listen; history; text; internal format)
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
MAPLE
select(t -> 25 &^ t - 1 mod t = 0, [seq(i, i=1..10^4, 2)]); # Robert Israel, Oct 04 2020
CROSSREFS
Sequence in context: A244972 A044055 A029542 * A014945 A045590 A369768
KEYWORD
nonn
AUTHOR
EXTENSIONS
Edited by Max Alekseyev, Nov 16 2019
STATUS
approved

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)