id:A139689 - OEIS Search Results

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If (n-th Chen prime) + 2 is a prime then 1 else 0.

+0
3

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

	OFFSET	`1,1`
	COMMENT	`a(n) = A010051(A139690(n)) = 1 - A064911(A139690(n)).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..1000` `Index entries for characteristic functions` `Eric Weisstein's World of Mathematics, Chen Prime`
	FORMULA	`a(n) = 2 - A001222(A139690(n)).`
	CROSSREFS	`Sequence in context: A010051 A131929 A100821 this_sequence A073070 A099104 A066829` `Adjacent sequences: A139686 A139687 A139688 this_sequence A139690 A139691 A139692`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 29 2008`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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