This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A046457 #9 Aug 10 2025 19:48:35
%S A046457 256,6561,390625,2484375,5764801,13361565,25765131,69090879,89994375,
%T A046457 110875779,125919255,128035545,188245551,207847185,210815759,
%U A046457 214358881,242810337,246891183,246944565,272828031,400792119,464794365,475376391
%N A046457 Concatenation of the 8 prime factors of composite a(n) is a palindrome.
%e A046457 2484375 = 3 * 5 * 5 * 5 * 5 * 5 * 5 * 53 -> 355555553 is palindromic.
%t A046457 For[n=2,n<1000000,n++,factors=FactorInteger[n]; If[Total[Transpose[factors][[2]]]!=8,Continue[]];digits={}; For[i=1,i<=Length[factors],i++, digits=Join[digits, Flatten[Table[IntegerDigits[factors[[i,1]]],{factors[[i,2]]}]]];]; If[digits==Reverse[digits],Print[n]];]; (* Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 17 2006 *)
%Y A046457 Cf. A046447.
%K A046457 nonn,base
%O A046457 0,1
%A A046457 _Patrick De Geest_, Jul 15 1998
%E A046457 More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 17 2006