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 A073260 Length of FixedPointList leading to value of [10^n]-th composite number. 1
 4, 4, 4, 5, 5, 6, 7, 7, 7, 8, 8, 9, 9 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS One plus the number of iterations necessary to reach the composite number using the formula in the program. - Robert G. Wilson v, Jul 23 2002 LINKS Table of n, a(n) for n=1..13. FORMULA See program below. EXAMPLE n=10^11: the list= {100000000000, 104118054814, 104280509328, 104286914053, 104287166025, 104287176027, 104287176414, 104287176419}, its length including initial term is 8, so a(11)=8. MATHEMATICA Table[Length[FixedPointList[10^w+PrimePi[ # ]+1&, 10^w]]-1, {w, 1, 11}] CROSSREFS Cf. A064814, A065857, A002808, A073255-A073264. Sequence in context: A369339 A368868 A134992 * A350459 A036854 A036858 Adjacent sequences: A073257 A073258 A073259 * A073261 A073262 A073263 KEYWORD nonn,more AUTHOR Labos Elemer, Jul 22 2002 EXTENSIONS More terms from Robert G. Wilson v, Jul 23 2002 STATUS approved

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Last modified August 14 07:07 EDT 2024. Contains 375146 sequences. (Running on oeis4.)