id:A074802 - OEIS Search Results

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Number of numbers k <= n such that tau(k)=tau(k+1) where tau(x)=A000005(x) is the number of divisors of x.

+0
1

0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 12, 12, 12, 12, 12, 12, 12, 13, 14 (list; graph; listen)

	OFFSET	`1,14`
	FORMULA	`Is a(n) asymptotic to c*n with c=0.1......?`
	PROGRAM	`(PARI) a(n)=sum(i=1, n, if(numdiv(i)-numdiv(i+1), 0, 1))`
	CROSSREFS	`Cf. A005237.` `Sequence in context: A052374 A003074 A067100 this_sequence A071804 A111894 A025845` `Adjacent sequences: A074799 A074800 A074801 this_sequence A074803 A074804 A074805`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 08 2002`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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