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 A167490 #4 Jul 22 2025 07:28:33 %S A167490 0,3,7,12,31,24,127,48,56,96,2047,99,8191,384,224,195,131071,199, %T A167490 524287,387,896,6144,8388607,391,992,24576,455,1539,536870911,775 %N A167490 a(n) = Smallest number with binary run length product = n. %C A167490 a(p) = 2^p - 1 for prime p %e A167490 a(4) = 12, because 12 is the smallest number with a binary run length product of 4. %e A167490 12 decimal = 1100 binary. Run lengths in binary are 2,2, and 2x2 = 4. %Y A167490 Cf. A167489 - Product of run length in binary representation of n %Y A167490 Cf. A167491 - Numbers in this sequence sorted in ascending order %K A167490 nonn %O A167490 1,2 %A A167490 _Andrew Weimholt_, Nov 05 2009