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A045084
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Numbers whose base-4 representation contains exactly four 0's and three 3's.
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1
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12303, 12339, 12348, 12483, 12492, 12528, 13059, 13068, 13104, 13248, 15363, 15372, 15408, 15552, 16128, 16447, 16591, 16627, 16636, 17167, 17203, 17212, 17347, 17356, 17392, 19471, 19507, 19516, 19651, 19660
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OFFSET
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1,1
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LINKS
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MAPLE
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Res:= NULL:
for d from 7 to 8 do
for i from 0 to d-7 do
L:= [0$4, 3$3, 1$i, 2$(d-7-i)];
P:= remove(t -> t[-1]=0, combinat:-permute(L));
Res:= Res, op(map(t -> add(t[i]*4^(i-1), i=1..d), P));
od od:
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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