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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A028980 Numbers n such that sum of divisors of n is palindromic. 7
 1, 2, 3, 4, 5, 7, 43, 81, 96, 98, 130, 146, 162, 166, 201, 205, 208, 211, 221, 241, 244, 251, 271, 274, 281, 300, 314, 325, 333, 365, 388, 422, 433, 438, 443, 463, 489, 519, 559, 633, 685, 793, 803, 827, 857, 877, 887, 1376, 1419, 1505, 1548 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 P. De Geest, World!Of Numbers MAPLE isA028980 := proc(n)     isA002113(numtheory[sigma](n)) ; end proc: for n from 1 to 2000 do     if isA028980(n) then         printf("%d, ", n) ;     end if; end do: # R. J. Mathar, Sep 09 2015 MATHEMATICA Select[Range[1550], Reverse[x=IntegerDigits[DivisorSigma[1, #]]]==x&] (* Jayanta Basu, Jun 05 2013 *) CROSSREFS Cf. A000203, A002113. Sequence in context: A276522 A135709 A263043 * A183108 A096841 A029963 Adjacent sequences:  A028977 A028978 A028979 * A028981 A028982 A028983 KEYWORD nonn,base AUTHOR 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.

Last modified September 24 21:35 EDT 2020. Contains 337322 sequences. (Running on oeis4.)