A083241 - OEIS

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A083241

a(n)+a(n-1)+a(n-2)+a(n-3)=p[n], the n-th prime if p[n]>3, a(1)=a(2)=a(3)=0;.

0, 0, 0, 5, 2, 4, 2, 9, 4, 8, 8, 11, 10, 12, 10, 15, 16, 18, 12, 21, 20 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	FORMULA	`A001221[a[n]-A000720[a[n]]]=1 and a[n]-A000720[a[n]] is in A025475.`
	EXAMPLE	`a(3)+a(4)+a(5)+a(6)=5+2+4+2=p[6]=13`
	MATHEMATICA	`Do[s=Prime[n]-n; If[Equal[Length[FactorInteger[s]], 1]&&!PrimeQ[s], Print[Prime[n]]], {n, 1, 100000}]`
	CROSSREFS	`Sequence in context: A181697 A181696 A157121 * A111145 A021660 A064853` `Adjacent sequences: A083238 A083239 A083240 * A083242 A083243 A083244`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Apr 24 2003`

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Last modified February 15 19:09 EST 2012. Contains 205852 sequences.