A192161 Monotonic ordering of nonnegative differences 4^i-5^j, for 40>= i>=0, j>=0.

0, 3, 11, 15, 39, 59, 63, 131, 231, 251, 255, 399, 759, 899, 971, 999, 1019, 1023, 3471, 3971, 4071, 4091, 4095, 13259, 15759, 16259, 16359, 16379, 16383, 49911, 62411, 64911, 65411, 65511, 65531, 65535, 184019, 246519, 259019, 261519, 262019, 262119, 262139

Offset

1,2

Links

Table of n, a(n) for n=1..43.

Example

The differences accrue like this:
1-1
4-1
16-5......16-1
64-25.....64-5.....64-1
256-125...256-25...256-5...256-1

Mathematica

c = 4; d = 5; t[i_, j_] := c^i - d^j;
u = Table[t[i, j], {i, 0, 40}, {j, 0, i*Log[d, c]}];
v = Union[Flatten[u ]]

Crossrefs

Cf. A192162.

Sequence in context: A039503 A276971 A366813 * A199262 A158507 A030765

Adjacent sequences: A192158 A192159 A192160 * A192162 A192163 A192164

Keyword

nonn

Author

Clark Kimberling, Jun 24 2011

Status

approved