login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A074630 Numbers k such that sigma(k) == 4 mod 6. 8
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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 14 15:46 EDT 2021. Contains 345026 sequences. (Running on oeis4.)