id:A008334 - OEIS Search Results

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Number of primes dividing p-1, where p = n-th prime.

+0
1

0, 1, 1, 2, 2, 2, 1, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 3, 3, 3, 2, 3, 2, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 2, 3, 3, 2, 2, 2, 2, 3, 3, 2, 2, 3, 4, 3, 2, 3, 2, 3, 3, 2, 1, 2, 2, 3, 3, 3, 3, 2, 3, 3, 3, 2, 4, 3, 2, 3, 2, 2, 3, 3, 3, 2, 2, 3, 2, 3, 3, 4, 3, 2, 3, 3, 2, 3, 3, 4, 2, 2, 2, 3, 3 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`This is omega(p-1), i.e. A001221(A006093(n)). For Omega(p-1)=A001222(A006093(n)), see A023508. - Lekraj Beedassy (blekraj(AT)yahoo.com), Oct 08 2004`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	MAPLE	`for i from 1 to 500 do if isprime(i) then print(nops(factorset(i-1))); fi; od;`
	CROSSREFS	`Sequence in context: A037809 A097195 A129451 this_sequence A116858 A106493 A083338` `Adjacent sequences: A008331 A008332 A008333 this_sequence A008335 A008336 A008337`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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