login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A246456 a(n) = sigma(n + sigma(n)). 9
3, 6, 8, 12, 12, 39, 24, 24, 36, 56, 24, 90, 40, 60, 56, 48, 48, 80, 56, 96, 54, 90, 48, 224, 120, 126, 68, 224, 60, 216, 104, 120, 121, 180, 84, 128, 124, 171, 120, 252, 84, 288, 120, 255, 168, 180, 120, 308, 162, 168, 168, 372, 108, 360, 128, 372, 138, 266 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
For n = 6; a(n) = sigma(6 + sigma(6)) = sigma(18) = 39.
PROG
(Magma) [SumOfDivisors(n+SumOfDivisors(n)):n in[1..1000]]
(PARI)
vector(100, n, sigma(n+sigma(n))) \\ Derek Orr, Sep 07 2014
CROSSREFS
Cf. A000203, A246909, A246907 (numbers n such that a(n) = 3n), A246915 (numbers n such that a(n) = a(n+1)).
Cf. Sequences of numbers n such that a(n) = k*sigma(n):
A246857 (k=2), A246910 (k=3), A246911 (k=4), A246912 (k=5), A246913 (k=6).
Sequence in context: A080598 A233541 A077148 * A070528 A243117 A356180
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Sep 07 2014
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)