login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

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

Cf. A014943, A014945, A014946, A014949, A014950, A014951, A014956, A014957, A128358, A128360, A014959, A014960.

Sequence in context: A244972 A044055 A029542 * A014945 A045590 A242740

Adjacent sequences:  A014959 A014960 A014961 * A014963 A014964 A014965

KEYWORD

nonn

AUTHOR

Olivier Gérard

EXTENSIONS

Edited by Max Alekseyev, Nov 16 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 2 11:46 EDT 2022. Contains 357205 sequences. (Running on oeis4.)