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Search: id:A073260
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| A073260 |
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Length of FixedPointList leading to value of [10^n]-th composite number. |
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+0
2
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| 4, 4, 4, 5, 5, 6, 7, 7, 7, 8, 8, 9, 9
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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One plus the number of iterations necessary to reach the composite number using the formula in the program. - Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 23 2002
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FORMULA
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See program below.
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EXAMPLE
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n=10^11: the list= {100000000000, 104118054814, 104280509328, 104286914053, 104287166025, 104287176027, 104287176414, 104287176419}, its length including initial term is 8, so a(11)=8.
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MATHEMATICA
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Table[Length[FixedPointList[10^w+PrimePi[ # ]+1&, 10^w]]-1, {w, 1, 11}]
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CROSSREFS
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Cf. A064814, A002808, A073255-A073264.
Sequence in context: A059112 A111731 A134992 this_sequence A036854 A036858 A131957
Adjacent sequences: A073257 A073258 A073259 this_sequence A073261 A073262 A073263
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jul 22 2002
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 23 2002
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