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A072362 Composite numbers whose sum of aliquot divisors is palindromic. 0
4, 6, 8, 9, 10, 15, 20, 21, 25, 36, 38, 45, 49, 54, 82, 87, 150, 189, 195, 219, 230, 243, 247, 248, 291, 321, 329, 333, 336, 352, 355, 381, 384, 385, 396, 398, 402, 411, 432, 458, 465, 471, 473, 478, 486, 501, 533, 536, 538, 552, 556, 561, 574, 578, 596, 602 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The sum of the aliquot digits of n must be greater than one. - From Harvey P. Dale, Aug 12 2012

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

a(8)=21: sum of aliquot divisors of 21=1+3+7=11, which is a palindrome.

MATHEMATICA

adpQ[n_]:=Module[{sad=Total[Most[Divisors[n]]], idsad}, idsad = IntegerDigits[sad]; sad>1&&idsad==Reverse[idsad]]; Select[Range[ 700], adpQ] (* Harvey P. Dale, Aug 12 2012 *)

CROSSREFS

Sequence in context: A316227 A062115 A141613 * A278948 A084988 A202265

Adjacent sequences:  A072359 A072360 A072361 * A072363 A072364 A072365

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta, Jul 18 2002

STATUS

approved

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Last modified May 31 22:11 EDT 2020. Contains 334756 sequences. (Running on oeis4.)