id:A091012 - OEIS Search Results

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Numbers having exactly one divisor d such that for some x also d-x and d+x are divisors.

+0
4

6, 15, 28, 40, 91, 153, 190, 220, 325, 496, 544, 561, 572, 627, 703, 861, 897, 935, 946, 1012, 1225, 1287, 1292, 1431, 1581, 1610, 1653, 1768, 1891, 2278, 2300, 2465, 2618, 2701, 2967, 3321, 3344, 3496, 3596, 3655, 3952, 4123, 4301, 4324, 4371 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A091009(a(n)) = 1.`
	CROSSREFS	`Cf. A091013, A091011.` `Sequence in context: A140091 A063525 A117519 this_sequence A058008 A094142 A081873` `Adjacent sequences: A091009 A091010 A091011 this_sequence A091013 A091014 A091015`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 13 2003`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

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