A055611 n written efficiently in natural numbers base, i.e., in form ...wxyz where n = 1*z + 2*y + 3*x + 4*w + ... with z <= 1, y < 2, x < 3, w < 4, ...

1, 10, 11, 101, 110, 111, 201, 210, 211, 1111, 1201, 1210, 1211, 2111, 2201, 2210, 2211, 3111, 3201, 3210, 3211, 12211, 13111, 13201, 13210, 13211, 22211, 23111, 23201, 23210, 23211, 32211, 33111, 33201, 33210, 33211, 42211, 43111, 43201

Offset

1,2

Links

Table of n, a(n) for n=1..39.

Example

a(9)=211 since 9 = 3*2 + 2*1 + 1*1 and alternatives such as 100000000 or 10101 are less efficient.

Crossrefs

Cf. A055992 for a slightly different definition.

Sequence in context: A361336 A348109 A125099 * A077813 A203075 A104326

Adjacent sequences: A055608 A055609 A055610 * A055612 A055613 A055614

Keyword

base,nonn

Author

Henry Bottomley, Jun 02 2000

Status

approved