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 A015961 Positive integers k such that k | (12^k + 1). 10
 1, 13, 169, 1027, 2197, 13351, 28561, 81133, 173563, 371293, 468481, 685633, 1054729, 2256319, 2890927, 4826809, 6090253, 6409507, 8913229, 13711477, 29332147, 37009999, 37582051, 54165007, 62748517, 79173289, 83323591, 115871977, 178249201 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS 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), A015960 (b=11), this sequence (b=12), A015963 (b=13), A015965 (b=14), A015968 (b=15), A015969 (b=16). Column k=12 of A333429. Sequence in context: A208030 A206990 A264367 * A264133 A221965 A206932 Adjacent sequences:  A015958 A015959 A015960 * A015962 A015963 A015964 KEYWORD nonn AUTHOR EXTENSIONS More terms from Max Alekseyev, Aug 01 2011 STATUS approved

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Last modified August 14 12:27 EDT 2020. Contains 336480 sequences. (Running on oeis4.)