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 A140174 #11 May 22 2025 16:40:30 %S A140174 0,2,30,1122,24300 %N A140174 Numbers k such that k = pi(k)*(sum of the digits of k). %C A140174 This sequence is a subsequence of A057809. There is no further term up to 16*10^6. %C A140174 a(6) > 1.4*10^22, if it exists. - _Giovanni Resta_, Aug 31 2018 %e A140174 24300 = pi(24300) * (2+4+3+0+0) = 2700 * 9. %t A140174 Select[Range[0,25000],PrimePi[#]Total[IntegerDigits[#]]==#&] (* _Harvey P. Dale_, Feb 13 2023 *) %Y A140174 Cf. A000720, A007953, A057809, A140173. %K A140174 base,more,nonn %O A140174 1,2 %A A140174 _Farideh Firoozbakht_, May 15 2008