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A095410 Numbers n such that total number of decimal digits of all distinct prime factors of n equals the number of digits of n. 3
2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 23, 24, 28, 29, 31, 35, 36, 37, 40, 41, 43, 45, 47, 48, 50, 53, 54, 56, 59, 61, 63, 67, 71, 72, 73, 75, 79, 80, 83, 89, 96, 97, 98, 101, 103, 104, 105, 106, 107, 109, 111, 113, 115, 116, 117, 118, 119, 120, 122 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Solutions to A095407[x]=A055642[x].
EXAMPLE
n=184, 3 digits,prime set={2,23} also with 3 digits {2,2,3}.
MATHEMATICA
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 Flatten[Position[t2-t1, 0]]
Rest[Select[Range[200], Length[Flatten[IntegerDigits/@Transpose[ FactorInteger[ #]][[1]]]]==IntegerLength[#]&]] (* Harvey P. Dale, Oct 22 2011 *)
CROSSREFS
Sequence in context: A175407 A232490 A052414 * A022293 A183218 A071000
KEYWORD
base,nonn
AUTHOR
Labos Elemer, Jun 21 2004
STATUS
approved

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Last modified April 15 13:47 EDT 2024. Contains 371689 sequences. (Running on oeis4.)