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 A379167 #32 Jan 11 2025 16:26:43 %S A379167 5,-1,34,-1,122,186,870,-1,1042,1146,1190,5610,-1,10118,10002,10030, %T A379167 10230,39270,-1,100462,100158,100030,100122,110670,881790,-1,1000478, %U A379167 1000022,1000010,1000758,1001130,1009470,-1,10000202,10000258,10000002,10000218,10001670,10010910,15825810 %N A379167 Table read by row, where T(n,k), n>0 and k>0, represents the smallest n-digit number that is the product of k distinct primes and is sandwiched between semiprime numbers, or -1 if no such number exists. %e A379167 Smallest n-digit numbers m product of k distinct primes sandwiched between two semiprimes m-1 and m+1: %e A379167 n k m-1, m, m+1 %e A379167 1 1 4 = 2^2, 5 = 5, 6 = 2 * 3; %e A379167 2 2 33 = 3 * 11, 34 = 2 * 17, 35 = 5 * 7; %e A379167 3 3 185 = 5 * 37, 186 = 2 * 3 * 31, 187 = 11 * 17; %e A379167 Table read by rows: %e A379167 5; %e A379167 -1, 34; %e A379167 -1, 122, 186, 870; %e A379167 -1, 1042, 1146, 1190, 5610; %e A379167 -1, 10118, 10002, 10030, 10230, 39270; %e A379167 -1, 100462, 100158, 100030, 100122, 110670, 881790; %e A379167 -1, 1000478, 1000022, 1000010, 1000758, 1001130, 1009470; %e A379167 -1, 10000202, 10000258, 10000002, 10000218, 10001670, 10010910, 15825810; %e A379167 ... %Y A379167 Cf. A001358, A067885, A378627, A378097. %K A379167 sign,tabf,base %O A379167 1,1 %A A379167 _Jean-Marc Rebert_, Dec 17 2024