A291746 Nonprimes of the form 5*k + 1.

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.

Links

Table of n, a(n) for n=1..58.

Mathematica

DeleteCases[5 Range[0, 200] + 1, _?PrimeQ]

Prog

(Magma) [n: n in [1..400 by 5] | not IsPrime(n)];

Crossrefs

Cf. A016861, A030430, A091113, A091300, A291745, A291747.

Sequence in context: A242331 A335226 A104392 * A037001 A118139 A087446

Adjacent sequences: A291743 A291744 A291745 * A291747 A291748 A291749

Keyword

nonn,easy

Author

Vincenzo Librandi, Aug 31 2017

Status

approved