id:A144020 - OEIS Search Results

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Numbers of the form 1+i^2+j^2+k^2 with 1 <= i <= j <= k.

+0
1

4, 7, 10, 12, 13, 15, 18, 19, 20, 22, 23, 25, 27, 28, 30, 31, 34, 35, 36, 37, 39, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 54, 55, 57, 58, 60, 62, 63, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 82, 83, 84, 85, 87, 89, 90, 91, 92, 94, 95, 97, 98, 99, 100, 102, 103, 105, 106 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`No number == -1 mod 8 is a sum of three squares, so multiples of 8 are missing from this sequence.` `It appears that numbers == 1 mod 16 are also missing from the sequence.`
	FORMULA	`a(n) = 1+A000408(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 03 2008]`
	CROSSREFS	`Sequence in context: A127958 A000414 A025357 this_sequence A047845 A097703 A104036` `Adjacent sequences: A144017 A144018 A144019 this_sequence A144021 A144022 A144023`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Dec 02 2008, Dec 21 2008`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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