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 A365493 #24 Jun 12 2025 14:30:17 %S A365493 2,18,44,112,418,776,1408,3072,7040,14848,53056,77312,147456,315392, %T A365493 988160,5310464,3194880,6225920,12845056,46252032,76873728,117440512, %U A365493 258998272,1072824320,1111490560,3379560448,5192548352,9261023232,24243077120,41204842496,81067507712 %N A365493 a(n) is the smallest number which can be represented as the sum of n n-almost primes in exactly n ways, or -1 if no such number exists. %H A365493 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AlmostPrime.html">Almost Prime</a>. %e A365493 For n = 2: 18 = 2*2 + 2*7 = 3*3 + 3*3. %Y A365493 Cf. A091538, A365494. %K A365493 nonn %O A365493 1,1 %A A365493 _Ilya Gutkovskiy_, Sep 07 2023 %E A365493 More terms from _David A. Corneth_, Jun 12 2025