A046362 Composite palindromes divided by the palindromic sum of their prime factors is a palindrome (counted with multiplicity).

4, 1345431, 12333321, 1425665241, 12026255262021, 35686666668653, 40181955918104, 128449444944821, 146426787624641, 651751101157156, 1734573883754371, 2313421221243132, 6858874224788586, 9889882002889889, 12446686768664421, 23265253035256232, 30153338083335103

Offset

1,1

Links

Giovanni Resta, Table of n, a(n) for n = 1..39 (terms < 10^19)

Example

1345431 = 3 * 17 * 23 * 31 * 37 -> Sum of factors is palindrome 111 -> 1345431 / 111 = 12121 and quotient is also palindromic.

Crossrefs

Cf. A046358, A046361.

Sequence in context: A124119 A090096 A218484 * A144122 A058424 A204041

Adjacent sequences: A046359 A046360 A046361 * A046363 A046364 A046365

Keyword

nonn,base

Author

Patrick De Geest, Jun 15 1998

Extensions

Edited name and a(5)-a(12) from Donovan Johnson, Oct 11 2011

a(13)-a(17) from Giovanni Resta, Nov 01 2019

Status

approved