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A014962
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Odd numbers k that divide 25^k - 1.
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1
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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
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OFFSET
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1,2
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COMMENTS
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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).
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LINKS
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MAPLE
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select(t -> 25 &^ t - 1 mod t = 0, [seq(i, i=1..10^4, 2)]); # Robert Israel, Oct 04 2020
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CROSSREFS
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Cf. A014943, A014945, A014946, A014949, A014950, A014951, A014956, A014957, A128358, A128360, A014959, A014960.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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