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 A213314 #7 Sep 01 2012 11:48:29 %S A213314 1017,1019,1023,1032,1035,1039,1053,1071,1072,1075,1077,1079,1093, %T A213314 1107,1109,1111,1112,1115,1119,1122,1125,1143,1147,1152,1155,1159, %U A213314 1170,1174,1176,1178,1181,1183,1187,1191,1192,1195 %N A213314 Numbers with exactly 7 nonprime substrings (substrings with leading zeros are considered to be nonprime). %C A213314 The sequence is finite. Proof: Each 8-digit number has at least 10 nonprime substrings. Thus, each number with more than 8 digits has >= 10 nonprime substrings, too. Consequently, there is a boundary b<10^7, such that all numbers > b have more than 7 nonprime substrings. %C A213314 The first term is a(1)=1017=A213302(7). The last term is a(4362)=3733739=A213300(7). %H A213314 Hieronymus Fischer, <a href="/A213314/b213314.txt">Table of n, a(n) for n = 1..4362</a> %e A213314 a(1)=1017, since 1017 has 7 nonprime substrings (0, 1, 1, 01, 10, 017, 1017). %e A213314 a(4362)= 3733739 since there are 7 nonprime substrings (9, 33, 39, 7337, 73373, 373373, 733739). %Y A213314 Cf. A019546, A035232, A039996, A046034, A069489, A085823, A211681, A211682, A211684, A211685. %Y A213314 Cf. A035244, A079307, A213300 - A213321. %K A213314 nonn,fini,base %O A213314 1,1 %A A213314 _Hieronymus Fischer_, Aug 26 2012