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A256304
Apply the transformation 0 -> 1 -> 2 -> 3 -> 0 to the digits of n written in base 4; do not convert back to base 10.
3
1, 2, 3, 0, 21, 22, 23, 20, 31, 32, 33, 30, 1, 2, 3, 0, 211, 212, 213, 210, 221, 222, 223, 220, 231, 232, 233, 230, 201, 202, 203, 200, 311, 312, 313, 310, 321, 322, 323, 320, 331, 332, 333, 330, 301, 302, 303, 300, 11, 12, 13, 10, 21, 22, 23, 20, 31, 32
OFFSET
0,2
COMMENTS
Base 4 variant of A256078 (base 2) and A048379 (base 10). See A256303 - A256308 for bases 3 through 8, A256289 for base 9, and A256294 for the variant where the result is converted back to base 10.
EXAMPLE
a(4) = 21 because 4 = "10" (in base 4) becomes "21".
a(15) = 0 because 15 = "33" (in base 4) becomes "00".
PROG
(PARI) A256304(n, b=4)=!n+eval(Strchr(apply(d->(d+1)%b+48, digits(n, b))))
CROSSREFS
Sequence in context: A009206 A318146 A088874 * A002634 A319173 A295945
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Mar 22 2015
STATUS
approved