Concatenation of the 8 prime factors of composite a(n) is a palindrome.

Terms

a(0) =256a(1) =6561a(2) =390625a(3) =2484375a(4) =5764801a(5) =13361565a(6) =25765131a(7) =69090879a(8) =89994375a(9) =110875779a(10) =125919255a(11) =128035545a(12) =188245551a(13) =207847185a(14) =210815759a(15) =214358881a(16) =242810337a(17) =246891183a(18) =246944565a(19) =272828031a(20) =400792119a(21) =464794365a(22) =475376391