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 A051999 #17 Aug 25 2019 15:34:21 %S A051999 4,15,255,5865,170085,5437705,226473065,10380578845,494390700895, %T A051999 43592479037107 %N A051999 Minimal value w such that A051953(w) = w - phi(w) is prime and w has n prime divisors. %C A051999 a(11) <= 2995513256722805. - _Donovan Johnson_, Feb 06 2010 %e A051999 a(1)=2^2, a(2)=3*5, a(3)=3*5*17, a(4)=3*5*17*23, a(5)=3*5*17*23*29, a(6)=5437705=5*7*13*17*19*37 with 1,2,3,4,5,6 prime divisors, respectively. The generated primes of form w - phi(w) are as follows: 2, 7, 127, 3049, 91237, 2452721. %Y A051999 Cf. A050530, A051953. %K A051999 nonn,more %O A051999 1,1 %A A051999 _Labos Elemer_, Jan 05 2000 %E A051999 a(7)-a(10) from _Donovan Johnson_, Feb 06 2010