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 A050709 #11 Oct 18 2019 17:00:39 %S A050709 49,50,52,56,84,88,169,176,180,198,220,302,322,336,339,363,364,372, %T A050709 387,402,406,407,424,429,434,442,492,494,508,552,553,562,589,612,628, %U A050709 633,650,708,724,744,760,788,816,819,843,848,860,861,862,870,872,896,918 %N A050709 Composites c that reach a prime after 5 iterations of c-> c+sum of prime factors of c. %e A050709 49 is a term: %e A050709 Iteration 1: 49 = 7*7 so 49 + (7+7) = 49 + 14 = 63 and composite. %e A050709 Iteration 2: 63 = 3*3*7 so 63 + (3+3+7) = 63 + 13 = 76 and composite. %e A050709 Iteration 3: 76 = 2*2*19 so 76 + (2+2+19) = 76 + 23 = 99 and composite. %e A050709 Iteration 4: 99 = 3*3*11 so 99 + (3+3+11) = 99 + 17 = 116 and composite. %e A050709 Iteration 5: 116 = 2*2*29 so 116 + (2+2+29) = 116 + 33 = 149 and prime. %Y A050709 Cf. A050703, A050704, A050705, A050706, A050707, A050708, A050710. %K A050709 nonn %O A050709 1,1 %A A050709 _Patrick De Geest_, Aug 15 1999 %E A050709 Name edited by _Michel Marcus_, Oct 18 2019