id:A063729 - OEIS Search Results

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Numbers n such that sigma(n)+1 is a square and sets a new record for such squares.

+0
1

2, 7, 8, 14, 32, 54, 60, 72, 84, 120, 196, 252, 312, 378, 512, 540, 860, 990, 1020, 1350, 1488, 1560, 2190, 2232, 3084, 3144, 3288, 3444, 3456, 4620, 7740, 8520, 9720, 13080, 13500, 19230, 19590, 20088, 21120, 27090, 29064, 29232, 31500, 42336 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) j=[]; for(n=1, 70000, x=sigma(n)+1; if(issquare(x), b=x; if(b>a, a=b; \ j=concat(j, n)))); j`
	CROSSREFS	`Cf. A063531.` `Sequence in context: A063531 A063771 A064293 this_sequence A023178 A080572 A032689` `Adjacent sequences: A063726 A063727 A063728 this_sequence A063730 A063731 A063732`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 12 2001`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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