id:A053569 - OEIS Search Results

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Sum of divisors of numbers which cannot be sum of divisors of any number.

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3, 6, 13, 18, 12, 31, 18, 20, 32, 36, 24, 31, 42, 40, 30, 48, 54, 48, 38, 42, 44, 78, 72, 48, 57, 93, 72, 98, 54, 72, 90, 60, 62, 127, 84, 144, 68, 96, 144, 72, 74, 124, 140, 96, 80, 121, 126, 84, 108, 132, 120, 180, 90, 168, 144, 120, 98, 156, 217, 102, 104, 192, 162 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`See also comments to A053474`
	FORMULA	`a(n)=A000203[A007369[n]]`
	EXAMPLE	`The 13th non-sigma number is 26.Its divisors are: {26,13,2,1} of which the sum is 42.So a(13)=42. Also a(20)=42, the divisor sum of 20th term in A007369, which is 41.`
	CROSSREFS	`A000203, A007369, A053474.` `Adjacent sequences: A053566 A053567 A053568 this_sequence A053570 A053571 A053572` `Sequence in context: A013563 A009788 A102966 this_sequence A115283 A078382 A075651`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 17 2000`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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