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A284797
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Write in base k, complement, reverse. Case k = 3.
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2
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2, 1, 0, 7, 4, 1, 6, 3, 0, 25, 16, 7, 22, 13, 4, 19, 10, 1, 24, 15, 6, 21, 12, 3, 18, 9, 0, 79, 52, 25, 70, 43, 16, 61, 34, 7, 76, 49, 22, 67, 40, 13, 58, 31, 4, 73, 46, 19, 64, 37, 10, 55, 28, 1, 78, 51, 24, 69, 42, 15, 60, 33, 6, 75, 48, 21, 66, 39, 12, 57, 30
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OFFSET
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0,1
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LINKS
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EXAMPLE
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a(9) = 25 because 9 in base 3 is 100, its complement in base 3 is 122 and the digit reverse is 221 that is 25 in base 10.
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MAPLE
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P:=proc(q, h) local a, b, k, n; print(h-1); for n from 1 to q do a:=convert(n, base, h); b:=0;
for k from 1 to nops(a) do a[k]:=h-1-a[k]; b:=h*b+a[k]; od; print(b); od; end: P(10^2, 3);
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MATHEMATICA
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Table[FromDigits[Reverse[2-IntegerDigits[n, 3]], 3], {n, 0, 70}] (* Harvey P. Dale, Sep 08 2019 *)
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PROG
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(Python)
from gmpy2 import digits
def A284797(n): return -int((s:=digits(n, 3)[::-1]), 3)-1+3**len(s) # Chai Wah Wu, Feb 04 2022
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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