A084440 - OEIS

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A084440

Number of ways to write the n-th prime as 1+p+p^k, p prime and k>0.

0, 0, 1, 2, 2, 1, 0, 1, 1, 0, 2, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	COMMENTS	`a(A084441(n))>0, a(A084442(n))=1, a(A084443(n))=0.`
	EXAMPLE	`a(11)=2: prime(11) = 31 = 1+5+5^2 = 1+3+3^3.`
	CROSSREFS	`Sequence in context: A074080 A179769 A111407 * A179287 A016372 A016342` `Adjacent sequences: A084437 A084438 A084439 * A084441 A084442 A084443`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 26 2003`

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Last modified February 14 17:10 EST 2012. Contains 205644 sequences.