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 A115661 #8 May 17 2017 03:16:01 %S A115661 1,2,3,4,5,6,7,8,9,11,12,13,15,16,17,21,22,23,26,28,31,32,33,36,37,39, %T A115661 44,45,51,54,55,56,57,58,61,62,63,65,66,68,69,71,73,75,77,79,82,85,86, %U A115661 88,93,96,97,99,101,107,108,111,113,115,116,117,121,122,123,125,128 %N A115661 Numbers n which have the same number of distinct prime divisors as the reverse of n. %H A115661 G. C. Greubel, <a href="/A115661/b115661.txt">Table of n, a(n) for n = 1..1000</a> %e A115661 omega(16)=omega(61)=1. %t A115661 Select[Range[130],PrimeNu[#]==PrimeNu[FromDigits[Reverse[ IntegerDigits[ #]]]]&] (* _Harvey P. Dale_, Jan 14 2012 *) %Y A115661 Cf. A001221, A115662. %K A115661 base,nonn %O A115661 1,2 %A A115661 _Giovanni Resta_, Jan 29 2006