id:A086669 - OEIS Search Results

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Number of divisors of n that are fundamental discriminants.

+0
1

1, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1, 2, 2, 1, 2, 2, 2, 1, 1, 2, 2, 1, 1, 4, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1, 2, 4, 2, 2, 1, 2, 2, 1, 1, 4, 1, 2, 2, 2, 2, 1, 2, 4, 2, 2, 1, 4, 2, 1, 2, 2, 4, 2, 1, 2, 2, 2, 1, 4, 2, 2, 2, 2, 2, 2, 1, 4, 1, 2, 1, 4, 4, 1, 2, 4, 2, 2, 2, 2, 2, 1, 2, 4, 2, 1, 2, 2 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`10 has divisors 1,2,5 and 10 of which 1 and 5 are fundamental discriminants, so a(10)=2`
	PROGRAM	`(PARI) for (n=1, 100, s=0; fordiv(i=n, i, s+=isfundamental(i)); print1(", "s))`
	CROSSREFS	`Sequence in context: A061337 A103684 A105103 this_sequence A053574 A065203 A029396` `Adjacent sequences: A086666 A086667 A086668 this_sequence A086670 A086671 A086672`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Jul 27 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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