The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A289814 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A289814

A binary encoding of the twos in ternary representation of n (see Comments for precise definition).
(history; published version)

#33 by Joerg Arndt at Thu May 09 03:12:18 EDT 2024

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reviewed

approved

#32 by Michel Marcus at Thu May 09 01:36:43 EDT 2024

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proposed

reviewed

#31 by Ruud H.G. van Tol at Wed May 08 10:09:33 EDT 2024

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editing

proposed

#30 by Ruud H.G. van Tol at Wed May 08 10:07:41 EDT 2024

PROG

(PARI) a(n) = fromdigits(digits(n, 3)\2, 2); \\ Ruud H.G. van Tol, May 08 2024

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approved

editing

Discussion

Wed May 08

10:09

Ruud H.G. van Tol: Added PROG. Could also use ">>1".

#29 by Joerg Arndt at Sun May 03 06:02:51 EDT 2020

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reviewed

approved

#28 by Michel Marcus at Sun May 03 05:59:09 EDT 2020

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proposed

reviewed

#27 by F. Chapoton at Sun May 03 05:25:36 EDT 2020

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editing

proposed

#26 by F. Chapoton at Sun May 03 05:25:27 EDT 2020

PROG

d = digits(n, 3)[1:]

return int("".join(['1' if i == 2 else '0' for i in d]), 2)

print map([a, (n) for n in range(101)]) # Indranil Ghosh, Jul 20 2017

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approved

editing

Discussion

Sun May 03

05:25

F. Chapoton: adapt python code to python3

#25 by Giovanni Resta at Mon Mar 09 06:10:20 EDT 2020

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proposed

approved

#24 by Michel Marcus at Mon Mar 09 05:57:37 EDT 2020

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editing

proposed