OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
a(2) = 81: sum of divisors of 81 = 1+3+9+27+81 = 121, which is a palindrome.
MATHEMATICA
Select[Range[3000], CompositeQ[#] && PalindromeQ @ DivisorSigma[1, #] &] (* Amiram Eldar, Aug 17 2020 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Jul 18 2002
EXTENSIONS
More terms from Amiram Eldar, Aug 17 2020
STATUS
approved