A074630 Numbers k such that sigma(k) == 4 mod 6.

3, 12, 27, 48, 75, 91, 108, 133, 192, 217, 243, 247, 259, 273, 300, 301, 343, 363, 364, 399, 403, 427, 432, 469, 481, 511, 532, 553, 559, 589, 651, 675, 679, 703, 721, 741, 763, 768, 777, 793, 817, 819, 867, 868, 871, 889, 903, 949, 972, 973, 988, 1027, 1029

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

Mod(A000203(n), 6) = 4.

{n: A084301(n) = 4}. - R. J. Mathar, May 19 2020

Example

k=48 is a term because sigma(48) = 1+2+3+4+6+8+12+16+24+48 = 124 = 6*20 + 4. [corrected by Harvey P. Dale, Jan 17 2013]

Mathematica

Select[Range[1100], Mod[DivisorSigma[1, #], 6]==4&] (* Harvey P. Dale, Jan 17 2013 *)

Crossrefs

Cf. A000203, A067051, A072862, A074384, A074627, A074628.

Sequence in context: A271183 A125614 A061936 * A033428 A213486 A018230

Adjacent sequences: A074627 A074628 A074629 * A074631 A074632 A074633

Keyword

easy,nonn

Author

Labos Elemer, Aug 26 2002

Status

approved