id:A105700 - OEIS Search Results

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a(n)=1 if n is a prime, 2 if n is a semiprime, otherwise 0.

+0
10

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

	OFFSET	`0,5`
	EXAMPLE	`a(4)=1 because n=3 is a prime;` `a(5)=2 because n=4 is a semiprime;` `a(9)=0 because n=8 is not prime neither semiprime.`
	CROSSREFS	`Cf. A105661.` `Sequence in context: A118829 A118832 A122807 this_sequence A159817 A030205 A079532` `Adjacent sequences: A105697 A105698 A105699 this_sequence A105701 A105702 A105703`
	KEYWORD	`easy,nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), May 04 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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