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 A215508 #21 Nov 24 2024 11:27:54 %S A215508 1,2,3,41,58,106,193,337,586,949,1061,1117,1153,1249,1669,2381,3733, %T A215508 5857,6577,6781,8389,11173,14293,15817,17137,17209,23017,37921,38377, %U A215508 46261,47293,56929,82561,90121,113173,122401,148957,151057,161149,163729,193873,206209,225769,322513,497473,576529,676129,686893,706621,862921,946489,992281,1032649,1198081,1597033,1655677,1779409,1930021,2299489,2367481,2584081,3209281,3528409,3933073,4068241,4160521,4283689,4726009,4833901 %N A215508 Smallest m such that the period of the continued fraction of sqrt(m) is A215485(n); records of A013646. %C A215508 The continued fractions of these numbers have the "hard to get" lengths listed in sequence A215485. They fill the last gaps in the table when computing A013646. %H A215508 Patrick McKinley, <a href="/A215508/b215508.txt">Table of n, a(n) for n = 0..253</a> %F A215508 a(n) = A013646(A215485(n)). - _Pontus von Brömssen_, Nov 24 2024 %e A215508 The lengths of the continued fractions of sqrt(1), sqrt(2), sqrt(3) and sqrt(41) are 0, 1, 2 and 3 respectively. The rest of the sequence follows A215485 similarly. %Y A215508 Cf. A013646, A215485. %K A215508 nonn %O A215508 0,2 %A A215508 _Patrick McKinley_, Aug 13 2012