login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A076887 Sum of divisors of palindromic numbers. 1
1, 3, 4, 7, 6, 12, 8, 15, 13, 12, 36, 48, 84, 72, 144, 96, 180, 156, 102, 152, 133, 132, 192, 152, 192, 260, 182, 192, 306, 378, 456, 450, 399, 728, 396, 558, 576, 518, 408, 314, 360, 494, 400, 354, 532, 374, 384, 528, 714, 936, 810, 768, 1064, 684, 930, 960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

a(11)=36 because 36 is the sum of divisors of 11th palindromic number (i.e. 22).

MATHEMATICA

DivisorSigma[1, #]&/@Select[Range[500], PalindromeQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 06 2018 *)

CROSSREFS

Sequence in context: A168338 A034690 A069192 * A140782 A284587 A097011

Adjacent sequences:  A076884 A076885 A076886 * A076888 A076889 A076890

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta, Nov 25 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 October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)