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A291746
Nonprimes of the form 5*k + 1.
2
1, 6, 16, 21, 26, 36, 46, 51, 56, 66, 76, 81, 86, 91, 96, 106, 111, 116, 121, 126, 136, 141, 146, 156, 161, 166, 171, 176, 186, 196, 201, 206, 216, 221, 226, 231, 236, 246, 256, 261, 266, 276, 286, 291, 296, 301, 306, 316, 321, 326, 336, 341, 346, 351, 356, 361, 366, 371
OFFSET
1,2
COMMENTS
Subsequence of A018252.
MATHEMATICA
DeleteCases[5 Range[0, 200] + 1, _?PrimeQ]
PROG
(Magma) [n: n in [1..400 by 5] | not IsPrime(n)];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 31 2017
STATUS
approved