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 A337915 #9 Oct 08 2020 18:47:56 %S A337915 36442589727570,59068995605115,70458333341415,93553802716515, %T A337915 99321073884915,104575423448670,225934088816670,241427108122215, %U A337915 245679971474670,257496300981015,263154806220570,275458942061070,312686748592170,425667633054315,448345051339515 %N A337915 Squarefree multiples of 15 such that a(n)+15 is also squarefree and all integers between are not squarefree. %C A337915 The terms are congruent to 15 or 870 mod 900 (900=2^2*3^2*5^2). The term a(1) is A109505(15) and A109473(10). %H A337915 Jud McCranie, <a href="/A337915/b337915.txt">Table of n, a(n) for n = 1..59</a> %Y A337915 Cf. A337914. %K A337915 nonn %O A337915 1,1 %A A337915 _Jud McCranie_, Oct 06 2020