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%I #34 Feb 05 2023 01:58:48
%S 2,52,881,12471,161436,1980642,23471475,271360653,3080075432,
%T 34465432859,381301109919,4179478903392,45459467009968,
%U 491241450001328,5278882299478796,56453500988940615,601181789833245631,6378285697775544230
%N Number of Pythagorean triples with hypotenuse <= 10^n.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PythagoreanTriple.html">Pythagorean Triple</a>
%F a(n) = A101929(n) + n. - _Robert G. Wilson v_, Mar 20 2014
%o (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 Cf. A101929.
%K nonn,more
%O 1,1
%A _Eric W. Weisstein_, Dec 21 2004
%E Corrected by Todd Stedl (tstedl(AT)speakeasy.net), Jan 15 2005
%E More terms from Jan Feitsma and Bart Dopheide (dopheide(AT)fmf.nl), Mar 10 2005
%E a(10)-a(11) from _Charles R Greathouse IV_, Sep 14 2012
%E a(12) from _Charles R Greathouse IV_, Oct 15 2012
%E a(13)-a(17) from _Hiroaki Yamanouchi_, Jul 14 2014
%E a(18) from _Matan M. Atzmoni_, Feb 04 2023