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 A303749 #8 May 05 2018 08:22:47 %S A303749 1,2,4,7,16,19,52,55,160,163,484,487,1456,1459,4372,4375,13120,13123, %T A303749 39364,39367,118096,118099,354292,354295 %N A303749 First differences of A302774; Number of terms in A303762 that have prime(n) as their largest prime factor (A006530). %C A303749 For n >= 1, the difference A000079(n-1) - a(n): 0, 0, 0, 1, 0, 13, 12, 73, 96, 349, 540, 1561, 2640, 6733, 12012, 28393, 52416, 117949, 222780, 484921, 930480, 1979053, 3840012, ..., indicates how many squarefree numbers A303762 misses in each round. The first of these is 70 missed at the round 4. %C A303749 The first differences of these terms is: 1, 2, 3, 9, 3, 33, 3, 105, 3, 321, 3, 969, 3, 2913, 3, 8745, 3, 26241, 3, 78729, 3, 236193, 3, ... which after the first two initial terms seem to be an interleaving of sequences A010701 and A036543. %F A303749 a(n) = A302774(n+1) - A302774(n). %Y A303749 Cf. A010701, A036543, A302774, A303762. %K A303749 nonn %O A303749 1,2 %A A303749 _Antti Karttunen_, May 05 2018