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 A015954 Numbers k such that k | 7^k + 1. 13
 1, 2, 10, 50, 250, 1250, 2810, 5050, 6250, 14050, 25250, 31250, 40210, 70250, 126250, 156250, 201050, 351250, 510050, 631250, 650050, 781250, 789610, 1005250, 1265050, 1419050, 1756250, 2550250, 3156250, 3250250, 3906250, 3948050, 5026250, 6325250, 7095250, 8781250, 9478130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..100 CROSSREFS Solutions to b^k == -1 (mod k): A006521 (b=2), A015949 (b=3), A015950 (b=4), A015951 (b=5), A015953 (b=6), this sequence (b=7), A015955 (b=8), A015957 (b=9), A015958 (b=10), A015960 (b=11), A015961 (b=12), A015963 (b=13), A015965 (b=14), A015968 (b=15), A015969 (b=16). Cf. A277370, A277401. Column k=7 of A333429. Sequence in context: A320521 A180266 A015945 * A015949 A020699 A020729 Adjacent sequences:  A015951 A015952 A015953 * A015955 A015956 A015957 KEYWORD nonn AUTHOR STATUS approved

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Last modified May 17 19:26 EDT 2021. Contains 343988 sequences. (Running on oeis4.)