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 A108575 #22 Jul 18 2021 11:34:03 %S A108575 3,7,8,13,14,15,22,23,24,32,33,34,35,44,47,48,58,59,60,62,63,74,75,78, %T A108575 79,80,95,96,98,99,114,119,120,135,136,138,140,141,142,143,160,162, %U A108575 164,167,168,185,187,189,192,194,195,215,219,220,222,223,224,248,252,254 %N A108575 Numbers k such that the continued fraction for sqrt(k) is multiplicative. %C A108575 m^2 - m < a(n) < m^2 for some m. %e A108575 The continued fraction for sqrt(7) is c = (2, 1, 1, 1, 4, 1, 1, 1, 4, ...) = A010121. If we index starting at 0, so that c(0) = 2, c is multiplicative (the value at c(0) is immaterial). Hence 7 is in the sequence. %Y A108575 Cf. A010121, A109054 (with squares included). %K A108575 nonn %O A108575 1,1 %A A108575 _David W. Wilson_, Jun 10 2005