login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A284809
Write in base k, complement, reverse. Case k = 9.
1
8, 7, 6, 5, 4, 3, 2, 1, 0, 79, 70, 61, 52, 43, 34, 25, 16, 7, 78, 69, 60, 51, 42, 33, 24, 15, 6, 77, 68, 59, 50, 41, 32, 23, 14, 5, 76, 67, 58, 49, 40, 31, 22, 13, 4, 75, 66, 57, 48, 39, 30, 21, 12, 3, 74, 65, 56, 47, 38, 29, 20, 11, 2, 73, 64, 55, 46, 37, 28, 19
OFFSET
0,1
EXAMPLE
a(14) = 34 because 14 in base 9 is 15, its complement in base 9 is 73 and the digit reverse is 37 that is 34 in base 10.
MAPLE
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, 9);
MATHEMATICA
Table[FromDigits[Reverse[8-#&/@IntegerDigits[n, 9]], 9], {n, 0, 70}] (* Harvey P. Dale, Mar 12 2023 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Paolo P. Lava, Apr 03 2017
STATUS
approved