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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
50, 85, 125, 130, 170, 185, 205, 221, 250, 265, 290, 305, 338, 365, 370, 377, 410, 425, 445, 493, 530, 533, 545, 578, 610, 629, 650, 685, 725, 754, 845, 850, 890, 905, 962, 965, 970, 986, 1010, 1037, 1073, 1105, 1130, 1145, 1165, 1205, 1250, 1258, 1313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

Stephan Daniel, On the sum of a square and a square of a prime, Math. Proc. Cambr. Phil. Soc. vol. 131. no. 1 (2001) 1-22.

Index entries for sequences related to sums of squares

EXAMPLE

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.

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

CROSSREFS

Sequence in context: A045165 A261286 A259670 * A224551 A262149 A228953

Adjacent sequences:  A138378 A138379 A138380 * A138382 A138383 A138384

KEYWORD

easy,nonn

AUTHOR

R. J. Mathar, May 08 2008

EXTENSIONS

Typo corrected by Zak Seidov, May 09 2008

STATUS

approved

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Last modified April 13 22:55 EDT 2021. Contains 342941 sequences. (Running on oeis4.)