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 A242945 #30 Aug 09 2017 21:58:51 %S A242945 5,91,919,7795,7984,9968647168,9991319797,9999761914432, %T A242945 9999982446427242496 %N A242945 Numbers n such that n + DigitProd(n) = 10^(A055642(n)). %C A242945 It is not known if this sequence is finite or infinite. %C A242945 a(10) (if it exists) is > 10^300. - _Max Alekseyev_, Jan 15 2015 %e A242945 919 + 9*1*9 = 1000 = 10^3. Thus 919 is a member of this sequence. %o A242945 (PARI) DP(n)=p=1;for(i=1,#digits(n),p*=digits(n)[i]);return(p) %o A242945 for(n=1,10^6, if((n+DP(n))==10^(#Str(n)),print(n))) %Y A242945 Cf. A007954. %K A242945 nonn,base,more,hard %O A242945 1,1 %A A242945 _Derek Orr_, May 27 2014 %E A242945 a(6)-a(9) from _Hiroaki Yamanouchi_, Jul 10 2014