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 A355897 #8 Aug 28 2022 11:39:03 %S A355897 7,7,14,14,15,17,29,64,71,79,119,120,127,223,239,260,287,288,319,320, %T A355897 447,484,511,512,519,960,967,968,969,1044,1151,1152,1155,1156,1279, %U A355897 1280,1283,1387,1791,1792,1919,1920,1921,2048,2051,2052,2079,3872,3875,3876,3879,3880,4095,4096 %N A355897 a(n) = index in A354790 of first nonprime term divisible by prime(n). %H A355897 N. J. A. Sloane, <a href="/A355897/b355897.txt">Table of n, a(n) for n = 1..236</a> %e A355897 The first few nonprime terms in B = A354790, and their prime factors are: %e A355897 n B(n)=p*q p pi(p) q pi(q) %e A355897 7, 6, 2, 1, 3, 2 %e A355897 14, 35, 5, 3, 7, 4 %e A355897 15, 22, 2, 1, 11, 5 %e A355897 17, 39, 3, 2, 13, 6 %e A355897 29, 85, 5, 3, 17, 7 %e A355897 31, 14, 2, 1, 7, 4 %e A355897 35, 33, 3, 2, 11, 5 %e A355897 B(14) = A354790(14) = 35 = 5*7 is the first nonprime term divisible by 5 = prime(3), therefore a(3) = 14. %Y A355897 Cf. A354790, A354791, A354792. %K A355897 nonn %O A355897 1,1 %A A355897 _N. J. A. Sloane_, Aug 28 2022