id:A053868 - OEIS Search Results

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Numbers n such that sum of divisors of n less than n is odd.

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2

2, 3, 4, 5, 7, 8, 11, 13, 15, 16, 17, 18, 19, 21, 23, 27, 29, 31, 32, 33, 35, 36, 37, 39, 41, 43, 45, 47, 50, 51, 53, 55, 57, 59, 61, 63, 64, 65, 67, 69, 71, 72, 73, 75, 77, 79, 83, 85, 87, 89, 91, 93, 95, 97, 98, 99, 100, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Numbers which are twice squares, even squares or odd non-squares.` `In other words: numbers whose sum of proper divisors is odd. [From Omar E. Pol (info(AT)polprimos.com), Aug 14 2009]`
	CROSSREFS	`Cf. A001065, A028982.` `Cf. A053869. [From Omar E. Pol (info(AT)polprimos.com), Aug 14 2009]` `Sequence in context: A062890 A058586 A090467 this_sequence A081730 A162408 A162721` `Adjacent sequences: A053865 A053866 A053867 this_sequence A053869 A053870 A053871`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Mar 29 2000`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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