id:A003995 - OEIS Search Results

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Sum of (any number of) distinct squares: of form r^2+s^2+t^2+... with 0<=r<s<t<...

+0
10

0, 1, 4, 5, 9, 10, 13, 14, 16, 17, 20, 21, 25, 26, 29, 30, 34, 35, 36, 37, 38, 39, 40, 41, 42, 45, 46, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 73, 74, 75, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 93, 94, 95, 97 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences related to sums of squares`
	FORMULA	`Exponents in expansion of (1+x)(1+x^4)(1+x^9)(1+x^16)(1+x^25)(1+x^36)(1+x^49)(1+x^64)(1+x^81)(1+x^100)(1+x^121)(1+x^144)...`
	PROGRAM	`(PARI) a(n)=if(n<1, 0, n=a(n-1); until(polcoeff(prod(k=1, sqrt(n), 1+x^k^2), n), n++); n)`
	CROSSREFS	`Cf. A001983, A033461, A008935. Complement of A001422.` `Sequence in context: A064801 A109825 A008935 this_sequence A064473 A001983 A143575` `Adjacent sequences: A003992 A003993 A003994 this_sequence A003996 A003997 A003998`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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