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 A070856 #11 Feb 11 2014 19:05:28 %S A070856 1,120,260,450,861,1411,1541,1550,7372,7957,8393,9312,13811,14840, %T A070856 20440,26060,38323,41550,46990,49813,51412,61050,77695,78625,86691, %U A070856 94604,94632,138631,143520,166331,169360,176820,182750,208150,236220,236840,270650 %N A070856 Numbers n such that sigma(reverse(n)) = phi(n). %H A070856 Donovan Johnson, <a href="/A070856/b070856.txt">Table of n, a(n) for n = 1..1000</a> %e A070856 sigma(reverse(120)) = sigma(21) = 32 = phi(120), so 120 is a term of the sequence. %t A070856 Select[ Range[ 10^6 ],EulerPhi[ # ]==DivisorSigma[ 1,FromDigits[ Reverse[ IntegerDigits[ # ] ] ] ]& ] %Y A070856 Cf. A000203, A000010, A004086, A070835. %K A070856 base,nonn %O A070856 1,2 %A A070856 _Joseph L. Pe_, May 16 2002 %E A070856 Extended by _Ray Chandler_, Feb 10 2009