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A060197
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Start at n, repeatedly apply pi(x) until reach 0; a(n) = number of steps to reach 0.
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0
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2, 3, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| Table[Length[FixedPointList[PrimePi, w]]-1, {w, 1, 1000}]
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EXAMPLE
| n=1000, the corresponding sequence of PrimePi-iteration is {1000,168,39,12,5,3,2,1,0}, whose the length is a(1000)=9. The numbers at which this sequence jumps from n to n+1 are A007097(n), terms of the primeth recurrence:1,2,3,5,11,31,127,709,5381,...
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CROSSREFS
| A007097, A000720.
Sequence in context: A088527 A030602 A133947 * A116487 A070546 A034586
Adjacent sequences: A060194 A060195 A060196 * A060198 A060199 A060200
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Mar 19 2001
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