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A352772
a(n) = A109812(n) AND A109812(n+2) (where AND denotes the bitwise AND operator).
2
0, 2, 0, 1, 8, 0, 2, 0, 2, 8, 16, 12, 0, 6, 0, 1, 16, 1, 4, 3, 32, 17, 32, 5, 32, 13, 0, 6, 0, 2, 9, 2, 1, 2, 1, 8, 5, 64, 19, 64, 3, 4, 3, 12, 64, 36, 80, 0, 24, 0, 1, 2, 1, 2, 33, 2, 4, 2, 4, 34, 65, 48, 72, 48, 66, 48, 70, 8, 3, 8, 3, 12, 128, 28, 128, 11
OFFSET
1,2
COMMENTS
The binary expansions of two consecutive terms of A109812 have no common 1's, but the binary expansions of two terms at distance 2 can have some common 1's; this sequence gives these common 1's.
EXAMPLE
For n = 42:
- A109812(42) = 68,
- A109812(44) = 28,
- so a(42) = 68 AND 28 = 4.
PROG
(C++) See Links section.
CROSSREFS
Sequence in context: A199459 A316649 A065329 * A108998 A356265 A309993
KEYWORD
nonn,look,base
AUTHOR
Rémy Sigrist, Apr 02 2022
STATUS
approved