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A084904
Number of places to insert a division operator in the decimal string of n such that an integer results.
2
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 2
OFFSET
0,102
COMMENTS
a(A084906(n))>0; record values: a(A000533(n))=n; a(n) < A055642(n).
FORMULA
a(n) = #{k: (n mod 10^k)>0 and ((n/10^k) mod (n mod 10^k))=0}.
EXAMPLE
a(42)=1, as 4/2=2; a(43)=0, as 4/3 is not an integer.
CROSSREFS
Cf. A084905.
Sequence in context: A071936 A005088 A076142 * A084928 A112316 A112802
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Jun 10 2003
STATUS
approved