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A330957
For any n >= 0: consider all pairs of numbers (x, y) whose binary representations can be interleaved (or shuffled) to produce the binary representation of n (possibly with leading zeros); a(n) is the least possible value of max(x, y).
2
0, 1, 1, 1, 1, 1, 2, 3, 1, 1, 2, 3, 2, 3, 3, 3, 1, 1, 2, 3, 2, 3, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7, 1, 1, 2, 3, 2, 3, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7, 3, 3, 3, 3, 4, 5, 6, 7, 6, 6, 6, 7, 6, 7, 7, 7, 1, 1, 2, 3, 2, 3, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7, 3, 3, 3, 3, 4, 5, 6
OFFSET
0,7
EXAMPLE
For n = 5:
- the binary representation of 5 is "101",
- the possible values for (x, y), restricted to x >= y without loss of generality, are:
bin(5) x y max(x, y)
------- - - ---------
"101" 5 0 5
"1/01" 1 1 1
"10/1" 2 1 2
"1/0/1" 3 0 3
- hence a(5) = 1.
PROG
(C) See Links section.
CROSSREFS
See A330925 for similar sequences.
Cf. A327192.
Sequence in context: A276336 A212811 A338854 * A352924 A327192 A351651
KEYWORD
nonn,base
AUTHOR
Rémy Sigrist, Jan 04 2020
STATUS
approved