id:A049084 - OEIS Search Results

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

+0
104

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`
	FORMULA	`a(n) = pi(n)*(pi(n)-pi(n-1)), pi=A000720. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.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)).` `Adjacent sequences: A049081 A049082 A049083 this_sequence A049085 A049086 A049087` `Sequence in context: A035376 A029220 A137303 this_sequence A108416 A108760 A137304`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

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