A015960 Numbers k such that k | 11^k + 1.

1, 2, 3, 9, 27, 81, 111, 122, 243, 333, 729, 999, 2187, 2997, 4107, 6561, 7442, 8991, 10233, 12321, 13203, 19683, 24753, 26973, 30699, 36963, 39609, 59049, 74259, 80919, 89426, 92097, 110889, 118341, 118827, 151959, 177147, 222777

Offset

1,2

Links

Seiichi Manyama, Table of n, a(n) for n = 1..200

Mathematica

Select[Range[250000], PowerMod[11, #, #]==#-1&] (* Harvey P. Dale, Nov 09 2022 *)

Crossrefs

Solutions to b^k == -1 (mod k): A006521 (b=2), A015949 (b=3), A015950 (b=4), A015951 (b=5), A015953 (b=6), A015954 (b=7), A015955 (b=8), A015957 (b=9), A015958 (b=10), this sequence (b=11), A015961 (b=12), A015963 (b=13), A015965 (b=14), A015968 (b=15), A015969 (b=16).

Cf. A333134.

Column k=11 of A333429.

Sequence in context: A057299 A057296 A057248 * A376478 A099079 A339831

Adjacent sequences: A015957 A015958 A015959 * A015961 A015962 A015963

Keyword

nonn

Author

Robert G. Wilson v

Status

approved