A085607 Non-palindromic n and its digit reversal have the same sum of prime factors (with repetition).

45, 54, 250, 495, 594, 1131, 1311, 2262, 2550, 2622, 2750, 2926, 3393, 3933, 4154, 4489, 4514, 4545, 4636, 4995, 5454, 5808, 5994, 6292, 6364, 6550, 7800, 8085, 8749, 9478, 9844, 12441, 13980, 14269, 14421, 15167, 15180, 15602, 16237, 18449, 18977

Offset: 1

Author

Jason Earls, Jul 08 2003

Keywords

• base
• nonn

Examples

			a(3)=250 because 250 = 2*5^3 and 52 = 2^2*13 and 2+5+5+5 = 2+2+13 = 17.
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..500

Crossrefs

Cf. A001414, A085870.

Programs

Mathematica

spf[n_]:=Total[Flatten[Table[#[[1]],#[[2]]]&/@FactorInteger[n]]]; spffQ[ n_]:=!PalindromeQ[n]&&spf[n]==spf[IntegerReverse[n]]; Select[Range[ 20000], spffQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 19 2017 *)

Extensions

Corrected by T. D. Noe, Oct 25 2006