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A090756
Numbers m of form 5k+1 such that binomial(m-1,(m-1)/5) == 1 (mod m).
1
11, 31, 41, 51, 61, 71, 101, 131, 141, 151, 181, 191, 211, 241, 251, 271, 281, 311, 321, 331, 401, 411, 421, 431, 461, 491, 521, 541, 571, 601, 631, 641, 661, 691, 701, 751, 761, 811, 821, 881, 911, 941, 951, 971, 991, 1021, 1031, 1051, 1061, 1091, 1151, 1171
OFFSET
1,1
COMMENTS
Contains primes of form 5k+1 and some composite of form 5k+1 such that (5k+1)/3 is prime.
LINKS
MATHEMATICA
Select[5*Range[0, 250] + 1, Mod[Binomial[# - 1, (# - 1)/5] , #] == 1 &] (* Amiram Eldar, May 08 2022 *)
CROSSREFS
Sequence in context: A167488 A361976 A298566 * A038351 A068871 A004615
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Feb 07 2004
EXTENSIONS
Offset corrected by Amiram Eldar, May 08 2022
STATUS
approved