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 A235812 #5 Jan 17 2014 04:30:13 %S A235812 2,2,2,2,1458855,1790478,429990136,4475873320,1979414080360 %N A235812 a(n) is the start of the earliest run of n numbers such that the sum of their digits is equal to the sum of the digits of their prime factors. %C A235812 This sequence takes into account both primes and Smith numbers (A006753). %C A235812 a(10) > 5*10^12. %H A235812 C. Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_247.htm"> Puzzle 247. Consecutive Smith numbers</a> %e A235812 The four numbers 2, 3, 4, 5 are either prime (2, 3, 5) or Smith (4) numbers. In any case, the sum of their digits is equal to the sum of their prime factors (counted with multiplicity), hence a(1) = a(2) = a(3) = a(4) = 2. %Y A235812 Cf. A006753, A059754. %K A235812 nonn,base %O A235812 1,1 %A A235812 _Giovanni Resta_, Jan 16 2014