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Search: id:A095407
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| A095407 |
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Total number of decimal digits of all distinct prime factors of n. |
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+0
9
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| 0, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 3, 2, 2, 1, 3, 1, 2, 2, 3, 2, 1, 3, 3, 2, 2, 2, 3, 3, 2, 2, 3, 2, 3, 2, 3, 2, 2, 1, 2, 3, 3, 2, 2, 3, 2, 3, 3, 2, 3, 2, 3, 2, 1, 3, 4, 2, 3, 3, 3, 2, 2, 2, 3, 2, 3, 3, 4, 2, 2, 1, 3, 2, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3, 3, 2, 2, 2, 3, 2, 3, 4, 3, 3, 3
(list; graph; listen)
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OFFSET
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1,6
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EXAMPLE
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n=22: prime set={2,11}, a[22]=1+2=3.
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MATHEMATICA
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ffi[x_] :=Flatten[FactorInteger[x]] lf[x_] :=Length[FactorInteger[x]] ba[x_] :=Table[Part[ffi[x], 2*j-1], {j, 1, lf[x]}] tdp[x_] :=Flatten[Table[IntegerDigits[Part[ba[x], j]], {j, 1, lf[x]}], 1] pl[x_] :=Length[tdp[x]] nl[x_] :=Length[IntegerDigits[x]] t1=Table[nl[w], {w, 1, 1000}]; t2=Table[pl[w], {w, 1, 1000}]; t2-t1
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CROSSREFS
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Cf. A055642.
Sequence in context: A086288 A104360 A079951 this_sequence A038605 A113121 A109036
Adjacent sequences: A095404 A095405 A095406 this_sequence A095408 A095409 A095410
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KEYWORD
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base,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jun 21 2004
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