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A274089 Numbers repeated except that powers of 2 only appear once. 4
1, 2, 3, 3, 4, 5, 5, 6, 6, 7, 7, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39, 40, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = floor(A057716(n) / 2). - Kevin Ryde, Apr 28 2024
PROG
(PARI) a(n) = n++; my(k=logint(n, 2)); n+=k; (n + bittest(n, k+1)) >> 1; \\ Kevin Ryde, Apr 28 2024
CROSSREFS
Cf. A057716.
Conjectured to be (essentially) the first differences of A002960.
Sequence in context: A167743 A020888 A196393 * A357409 A086335 A123387
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jun 10 2016
STATUS
approved

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Last modified May 24 12:58 EDT 2024. Contains 372773 sequences. (Running on oeis4.)