id:A141241 - OEIS Search Results

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a(n) = number of divisors of n-th positive integer with a nonprime number of divisors. a(n) = the number of divisors of A139118(n).

+0
2

1, 4, 4, 4, 6, 4, 4, 6, 6, 4, 4, 8, 4, 4, 6, 8, 6, 4, 4, 4, 9, 4, 4, 8, 8, 6, 6, 4, 10, 6, 4, 6, 8, 4, 8, 4, 4, 12, 4, 6, 4, 8, 6, 4, 8, 12, 4, 6, 6, 4, 8, 10, 4, 12, 4, 4, 4, 8, 12, 4, 6, 4, 4, 4, 12, 6, 6, 9, 8, 8, 8, 4, 12, 8, 4, 10, 8, 4, 6, 6, 4, 4, 16, 4, 4, 6, 4, 12, 8, 4, 8, 12, 4, 4, 8, 8, 8, 12, 4 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(1) = 1 and all other terms are composite, of course.`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	PROGRAM	`(PARI) for(i=1, 200, if(!isprime(numdiv(i)), print1(numdiv(i)", "))) [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Apr 09 2009]`
	CROSSREFS	`Cf. A139118, A141242.` `Sequence in context: A010304 A164821 A130331 this_sequence A140696 A160401 A114742` `Adjacent sequences: A141238 A141239 A141240 this_sequence A141242 A141243 A141244`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Jun 16 2008`
	EXTENSIONS	`More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Apr 09 2009`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.

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