id:A049084 - OEIS Search Results

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0 unless n is a prime p(k) when a(n) = k.

+0
121

0, 1, 2, 0, 3, 0, 4, 0, 0, 0, 5, 0, 6, 0, 0, 0, 7, 0, 8, 0, 0, 0, 9, 0, 0, 0, 0, 0, 10, 0, 11, 0, 0, 0, 0, 0, 12, 0, 0, 0, 13, 0, 14, 0, 0, 0, 15, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 17, 0, 18, 0, 0, 0, 0, 0, 19, 0, 0, 0, 20, 0, 21, 0, 0, 0, 0, 0, 22, 0, 0, 0, 23, 0, 0, 0, 0, 0, 24, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Equals row sums of triangle A143541 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 23 2008]`
	FORMULA	`a(n) = pi(n)*(pi(n)-pi(n-1)), pi=A000720. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2003` `a(n)=A000720[A000027(n).A010051(n)]. - Labos E. (labos(AT)ana.sote.hu), Jan 09 2004`
	MAPLE	`A049084 := proc(n) local i; if(isprime(n)) then for i from 1 to 1000000 do if(ithprime(i) = n) then RETURN(i); fi; od; else RETURN(0); fi; end;`
	CROSSREFS	`a(n) = A091227(A091202(n)).` `A143541 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 23 2008]` `Sequence in context: A035376 A029220 A137303 this_sequence A108416 A108760 A137304` `Adjacent sequences: A049081 A049082 A049083 this_sequence A049085 A049086 A049087`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.

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