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 A088070 #10 Feb 12 2018 04:29:07 %S A088070 3,4,6,8,10,11,12,13,18,19,21,23,24,25,26,27,28,30,34,35,37,39,42,45, %T A088070 47,48,49,51,53,55,56,57,60,64,72,73,75,76,80,81,82,86,87,92,93,94,95, %U A088070 97,99,102,105,107,108,116,117,118,123,126,131,134,135,138,139,142,143,144 %N A088070 Numbers sandwiched between two numbers having the same number of prime divisors. %C A088070 Subsidiary sequence: (1) Start of the first run of a string of n successive integers in this sequence. Conjecture: For every k there is a string of k successive integers. %H A088070 Giovanni Resta, <a href="/A088070/b088070.txt">Table of n, a(n) for n = 1..10000</a> %F A088070 a(n) = A063464(n) + 1. %e A088070 11 is a member as 10 and 12 both have two prime divisors. %e A088070 26 is a member as 25 and 27 both have one each prime divisor. %o A088070 (PARI) isok(n) = omega(n-1) == omega(n+1); \\ _Michel Marcus_, Oct 18 2016 %Y A088070 Cf. A063464. %K A088070 nonn %O A088070 1,1 %A A088070 _Amarnath Murthy_, Sep 22 2003 %E A088070 More terms from _Ray Chandler_, Sep 27 2003 %E A088070 Offset corrected and formula adapted by _Michel Marcus_, Oct 18 2016