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a(n)=1 if there is a number of the form 6k+3 such that prime(n) < 6k+3 < prime(n+1), otherwise 0.

+0
3

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

	OFFSET	`1,1`
	COMMENT	`Except for first two primes and twin primes, there is always at least one number of the form 6k+3 between two successive primes.`
	EXAMPLE	`a(3)=0 because between prime(3)=5 and prime(4)=7 there are no numbers of the form 6k+3;` `a(4)=1 because between prime(4)=7 and prime(5)=11 there is 9=6*1+3.`
	CROSSREFS	`Same as A100810 after first term.` `Sequence in context: A072783 A064911 A099618 this_sequence A066247 A151774 A095792` `Adjacent sequences: A105999 A106000 A106001 this_sequence A106003 A106004 A106005`
	KEYWORD	`easy,nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Apr 29 2005`
	EXTENSIONS	`Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 17 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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