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 A050771 #5 Oct 17 2019 22:44:00 %S A050771 8,9,34,38,51,65,68,85,96,116,143,224,225,304,306,416,448,544,546,570, %T A050771 600,621,640,714,783,810,1020,1134,1197,1254,1280,1408,1521,1540,1666, %U A050771 1716,1806,1900,1953,2088,2646,2760,3159,3185,3255,3392,3920,3968,4176 %N A050771 Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 4 skipped primes. %e A050771 a(2)=9 + (3+3) = 15 + (3+5) = ending prime 23. Between 9 and 23 one finds 4 primes 11, 13, 17 and 19. %Y A050771 Cf. A050703, A050710. %K A050771 nonn %O A050771 0,1 %A A050771 _Patrick De Geest_, Sep 15 1999