A028904 Map n = Sum c_i 10^i to a(n) = Sum c_i 9^i.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 90, 91, 92, 93

Offset

0,3

Comments

More than the usual number of terms are displayed in order to distinguish this from some closely related sequences. - N. J. A. Sloane, Mar 22 2014

Links

Alan Michael Gómez Calderón, Table of n, a(n) for n = 0..10000

Maple

f2:=proc(n) local t1, i, L;
t1:=convert(n, base, 10);
L:=nops(t1);
add(t1[i]*9^(i-1), i=1..L);
end;
[seq(f2(n), n=0..200)];

Prog

(PARI) a(n) = fromdigits(digits(n), 9); \\ Alan Michael Gómez Calderón, Sep 28 2025

Crossrefs

Sequence in context: A137721 A245339 A324161 * A081600 A239092 A017884

Adjacent sequences: A028901 A028902 A028903 * A028905 A028906 A028907

Keyword

nonn,base,easy

Author

N. J. A. Sloane

Extensions

More terms from Erich Friedman.

Status

approved