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Search: id:A109073
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| A109073 |
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Number of decimal digits ( counted with multiplicity ) in n^2 but not in n. |
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+0
1
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| 0, 0, 1, 1, 2, 1, 1, 2, 2, 2, 0, 1, 2, 2, 2, 2, 2, 3, 3, 2, 1, 2, 3, 2, 3, 1, 1, 1, 2, 3, 1, 2, 3, 4, 4, 3, 3, 3, 4, 4, 2, 2, 3, 3, 4, 3, 3, 4, 3, 3, 1, 3, 3, 4, 4, 3, 3, 4, 4, 4, 1, 3, 4, 2, 2, 3, 3, 4, 3, 3, 2, 3, 4, 3, 2, 2, 1, 4, 3, 4, 2, 3, 3, 2, 4, 3, 3, 3, 4, 3, 2, 3, 4, 3, 4, 2, 2, 2, 3, 3, 0, 1, 2, 2, 2
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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Cf. A076493 Number of common and distinct decimal digits of n and n^2, A109071 Number of common decimal digits ( counted with multiplicity ) of n and n^2, A109072 Number of decimal digits ( counted with multiplicity ) in n but not in n^2.
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EXAMPLE
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a(35)=4 because 34^2=1156 and there are 4 digits (counted with multiplicity) which are in 34^2 but not in 34.
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MATHEMATICA
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UnsortedComplement[x_List, y__List]:=Replace[x, Dispatch[(#\[RuleDelayed]Sequence[])&/@Union[y]], 1]; Table[Length[UnsortedComplement[IntegerDigits[n], IntegerDigits[n^2]]], {n, 0, 200}]
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CROSSREFS
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Cf. A076493, A109071, A109072.
Sequence in context: A024165 A023191 A029256 this_sequence A026465 A051486 A081355
Adjacent sequences: A109070 A109071 A109072 this_sequence A109074 A109075 A109076
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KEYWORD
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base,easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 20 2005
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