0,2

I.e. double (mod 5) each digit (0->0, 1->2, 2->4, 3->1, 4->3) of the base-5 representation of n)

Index entries for sequences related to Nim-sums

Index entries for sequences that are permutations of the natural numbers

Generalized nim sum m + n in base q: write m and n in base q and add mod q with no carries, e.g. 5 + 8 in base 3 = "21" + "22" = "10" = 1.

Inverse permutation: A065256. A004515[n] = A065257[n+1]-1 ("Quintal Queens" permutation)

Sequence in context: A069270 A079901 A121426 this_sequence A036560 A117297 A112973

Adjacent sequences: A004512 A004513 A004514 this_sequence A004516 A004517 A004518

nonn

N. J. A. Sloane (njas(AT)research.att.com).