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 A101930 #35 Feb 16 2025 08:32:55 %S A101930 2,52,881,12471,161436,1980642,23471475,271360653,3080075432, %T A101930 34465432859,381301109919,4179478903392,45459467009968, %U A101930 491241450001328,5278882299478796,56453500988940615,601181789833245631,6378285697775544230 %N A101930 Number of Pythagorean triples with hypotenuse <= 10^n. %H A101930 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PythagoreanTriple.html">Pythagorean Triple</a> %F A101930 a(n) = A101929(n) + n. - _Robert G. Wilson v_, Mar 20 2014 %o A101930 (PARI) a(n)=my(t,lim=10^n);for(m=2,sqrtint(lim-1),forstep(n=1+m%2,min(sqrtint(lim-m^2),m-1),2,if(gcd(m,n)==1,t+=lim\(m^2+n^2))));t \\ _Charles R Greathouse IV_, Sep 13 2012 %Y A101930 Cf. A101929. %K A101930 nonn,more %O A101930 1,1 %A A101930 _Eric W. Weisstein_, Dec 21 2004 %E A101930 Corrected by Todd Stedl (tstedl(AT)speakeasy.net), Jan 15 2005 %E A101930 More terms from Jan Feitsma and Bart Dopheide (dopheide(AT)fmf.nl), Mar 10 2005 %E A101930 a(10)-a(11) from _Charles R Greathouse IV_, Sep 14 2012 %E A101930 a(12) from _Charles R Greathouse IV_, Oct 15 2012 %E A101930 a(13)-a(17) from _Hiroaki Yamanouchi_, Jul 14 2014 %E A101930 a(18) from _Matan M. Atzmoni_, Feb 04 2023