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A067937 Let rep(n) be the n-th repunit number, sequence gives values of n such that rep(n)==rep(4) (mod n). 0
1, 2, 4, 5, 8, 10, 16, 20, 22, 25, 28, 37, 40, 44, 50, 52, 68, 70, 76, 80, 88, 92, 100, 110, 112, 116, 124, 125, 130, 148, 154, 164, 172, 176, 188, 200, 208, 212, 220, 236, 244, 250, 268, 280, 284, 286, 292, 316, 332, 340, 356, 364, 370, 388, 400, 404, 412, 418 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..58.

MATHEMATICA

Select[Range[500], Mod[FromDigits[PadRight[{}, #, 1]], #]==Mod[1111, #]&] (* Harvey P. Dale, Nov 12 2015 *)

CROSSREFS

Cf. A002275.

Sequence in context: A191288 A181666 A067943 * A003592 A192716 A159765

Adjacent sequences:  A067934 A067935 A067936 * A067938 A067939 A067940

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Mar 05 2002

STATUS

approved

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Last modified November 30 17:12 EST 2021. Contains 349424 sequences. (Running on oeis4.)