id:A087876 - OEIS Search Results

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a[n] =PrimePi[PrimePi[n-2]] + a[n - a[n-2]]

+0
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1, 1, 1, 1, 2, 3, 4, 4, 4, 5, 6, 6, 7, 7, 7, 7, 8, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 13, 13, 13, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 18, 18, 18, 19, 19, 19, 19, 20, 21, 21, 21, 21, 21, 21, 21, 22, 22, 23, 23, 23, 23, 23, 24, 25, 25, 26, 26, 26, 26, 27, 27, 27 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`A PrimePi reinversion based on Mallows A005229 as the pattern sequence.`
	MATHEMATICA	`mrid[n_Integer?Positive] := mrid[n] =PrimePi[PrimePi[n-2]] + mrid[n - mrid[n-2]] mrid[1] = mrid[2] = 1 digits=256 a=Table[mrid[n], {n, 1, digits}]`
	CROSSREFS	`Cf. A005229.` `Adjacent sequences: A087873 A087874 A087875 this_sequence A087877 A087878 A087879` `Sequence in context: A060740 A123273 A073425 this_sequence A006158 A135414 A140087`
	KEYWORD	`nonn`
	AUTHOR	`Roger L Bagula (rlbagulatftn(AT)yahoo.com), Oct 11 2003`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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