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 A152246 #6 Apr 09 2014 10:16:43 %S A152246 15,25,35,49,63,65,119,121,143,145,361,575,721,841,899,901,959,961, %T A152246 1023,1025,1261,1295,1679,1681,2519,2881,3071,3073,3599,3601,4095, %U A152246 4097,5041,5183,5185,6479,6721,9215,9217,10081,12287,14399,15119,20159,25199 %N A152246 Composites c where |c-m| = 1, where m is any of the smallest positive integers with their number of divisors. (m belongs to sequence A007416.) %e A152246 The smallest positive integer with 8 divisors is 24. 24 - 1 = 23 is prime. But 24 + 1 = 25 is composite. So 25 is in the sequence, while 23 is not. %Y A152246 A007416, A152245 %K A152246 nonn %O A152246 1,1 %A A152246 _Leroy Quet_, Nov 30 2008 %E A152246 Extended by _Ray Chandler_, Dec 05 2008