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A277554 Positive integers n such that 7^n == 3 (mod n). 5
1, 2, 46, 2227, 6684830083, 12827743861, 151652531182, 155657642297, 3102126273955, 11006109076099, 50473807426174, 172794904196354 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
No other terms below 10^15.
LINKS
PROG
(PARI) isok(n) = Mod(7, n)^n == 3; \\ Michel Marcus, Oct 20 2016
CROSSREFS
Cf. Solutions to 7^n == k (mod n): A277371 (k=-3), A277370 (k=-2), A015954 (k=-1), A067947 (k=1), A277401 (k=2).
Cf. Solutions to b^n == 3 (mod n): A050259 (b=2), A130422 (b=4), A123061 (b=5), A116629 (b=13).
Sequence in context: A264500 A173586 A074041 * A000191 A000192 A196197
KEYWORD
nonn,hard,more
AUTHOR
Max Alekseyev, Oct 19 2016
STATUS
approved

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Last modified July 12 08:07 EDT 2024. Contains 374239 sequences. (Running on oeis4.)