A015951 - OEIS

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A015951

Numbers n such that n | 5^n + 1.

1, 2, 3, 9, 21, 26, 27, 63, 81, 147, 189, 243, 338, 441, 567, 609, 729, 903, 1029, 1323, 1378, 1701, 1827, 2187, 2667, 2709, 3087, 3969, 4263, 4394, 4401, 5103, 5481, 6321, 6561, 7203, 8001, 8127, 9261, 9429, 11907, 12789, 13149, 13203 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Seiichi Manyama, Table of n, a(n) for n = 1..500`
	MATHEMATICA	`Select[Range@ 14000, Divisible[5^# + 1, #] &] (* Michael De Vlieger, Oct 10 2016 *)`
	PROG	`(PARI) isok(n) = Mod(5, n)^n == -1; \\ Michel Marcus, Oct 11 2016`
	CROSSREFS	`Cf. this sequence (k=1), A123052 (k=3), A123047 (k=4).` `Sequence in context: A036673 A111189 A001004 * A244666 A101531 A099607` `Adjacent sequences: A015948 A015949 A015950 * A015952 A015953 A015954`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v`
	STATUS	`approved`

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Last modified January 15 20:47 EST 2019. Contains 319184 sequences. (Running on oeis4.)