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 A056203 #8 Feb 16 2025 08:32:43 %S A056203 7,14,17,23,28,31,34,41,46,49,47,56,63,68,71,62,73,82,89,94,97,79,92, %T A056203 103,112,119,124,127,98,113,126,137,146,153,158,161,119,136,151,164, %U A056203 175,184,191,196,199,142,161,178,193,206,217,226,233,238,241,167,188 %N A056203 Triangle of numbers related to congruum problem: T(n,k)=n^2+2nk-k^2 with n>k>0, starting at T(2,1)=7. %C A056203 The congruum problem is to find h (A057103) such that there are integers x (A055096), y (A057105) and z (A056203) with h=x^2-y^2=z^2-x^2. %C A056203 Refers to A057102, which had an incorrect description and has been replaced by A256418. As a result the present sequence should be re-checked. - _N. J. A. Sloane_, Apr 06 2015 %H A056203 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CongruumProblem.html">Congruum Problem.</a> %F A056203 a(n) = sqrt(A057103(n)+A055096(n)^2) = sqrt(2*A057103(n)+A057105(n)^2). %e A056203 a(1) = T(2,1) = 2^2+2*2*1-1 = 7. %Y A056203 Cf. A057102. %K A056203 nonn,tabl %O A056203 1,1 %A A056203 _Henry Bottomley_, Aug 02 2000