A025284 - OEIS

This site is supported by donations to The OEIS Foundation.

A025284

Numbers that are the sum of 2 nonzero squares in exactly 1 way.

2, 5, 8, 10, 13, 17, 18, 20, 25, 26, 29, 32, 34, 37, 40, 41, 45, 52, 53, 58, 61, 68, 72, 73, 74, 80, 82, 89, 90, 97, 98, 100, 101, 104, 106, 109, 113, 116, 117, 122, 128, 136, 137, 146, 148, 149, 153, 157, 160, 162, 164, 169, 173, 178, 180, 181, 193, 194, 197, 202, 208, 212 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`A025426(a(n)) = 1. [Reinhard Zumkeller, Aug 16 2011]`
	LINKS	`Reinhard Zumkeller, Table of n, a(n) for n = 1..10000` `Eric Weisstein's World of Mathematics, Square Number` `G. Xiao, Two squares` `Index entries for sequences related to sums of squares`
	PROG	`(Haskell)` `import Data.List (elemIndices)` `a025284 n = a025284_list !! (n-1)` `a025284_list = elemIndices 1 a025426_list` `-- Reinhard Zumkeller, Aug 16 2011`
	CROSSREFS	`Cf. A000404, A081324, A125022, A018825, A001481, A007692.` `Sequence in context: A024509 A084889 A000404 * A140328 A000415 A172000` `Adjacent sequences: A025281 A025282 A025283 * A025285 A025286 A025287`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 00:09 EST 2012. Contains 205978 sequences.