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 A151764 #13 Apr 25 2023 15:32:48 %S A151764 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,217,20,21,22,32,24,25, %T A151764 26,27,28,128,30,31,32,33,34,35,36,37,434,39,40,14,42,142,44,45,64, %U A151764 146,48,49,50,51,52,35,54,55,56,651,256,455,60,16,62,63,64,65,66,364,68,96,70 %N A151764 a(n) = f(f(n)), where f(n) = A071786(n). %C A151764 Completely multiplicative. %H A151764 Reinhard Zumkeller, <a href="/A151764/b151764.txt">Table of n, a(n) for n = 1..10000</a> %H A151764 <a href="/index/Di#divseq">Index to divisibility sequences</a> %o A151764 (Haskell) %o A151764 a151764 = a071786 . a071786 -- _Reinhard Zumkeller_, Oct 14 2011 %o A151764 (PARI) rev(n)=fromdigits(Vecrev(digits(n))) %o A151764 A071786(n)=my(f=factor(n)); prod(i=1,#f~,rev(f[i,1])^f[i,2]) %o A151764 a(n)=A071786(A071786(n)) \\ _Charles R Greathouse IV_, Jun 28 2015 %Y A151764 Cf. A071786. %K A151764 nonn,base,mult %O A151764 1,2 %A A151764 _N. J. A. Sloane_, Jun 22 2009, Jun 23 2009