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A138381 Numbers which are the sum of a strictly positive square and a square of a prime in two or more ways. 0

%I #5 Mar 30 2012 17:39:32

%S 50,85,125,130,170,185,205,221,250,265,290,305,338,365,370,377,410,

%T 425,445,493,530,533,545,578,610,629,650,685,725,754,845,850,890,905,

%U 962,965,970,986,1010,1037,1073,1105,1130,1145,1165,1205,1250,1258,1313

%N Numbers which are the sum of a strictly positive square and a square of a prime in two or more ways.

%H Stephan Daniel, <a href="http://journals.cambridge.org/action/displayAbstract?aid=88659">On the sum of a square and a square of a prime</a>, Math. Proc. Cambr. Phil. Soc. vol. 131. no. 1 (2001) 1-22.

%H <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>

%e 50 = 1^2+7^2 = 5^2+5^2. 85 = 6^2+7^2 = 9^2+2^2. 125 = 2^2+11^2 = 10^2+5^2.

%e 425 = 8^2+19^2 = 16^2+13^2 = 20^2+5^2 .

%K easy,nonn

%O 1,1

%A _R. J. Mathar_, May 08 2008

%E Typo corrected by Zak Seidov, May 09 2008

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)