The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A028897 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A028897

If n = Sum c_i 10^i then a(n) = Sum c_i 2^i.
(history; published version)

#44 by M. F. Hasler at Tue Jun 20 17:03:06 EDT 2023

STATUS

editing

approved

#43 by M. F. Hasler at Tue Jun 20 17:03:01 EDT 2023

CROSSREFS

Differs from A081594 and A244158 for the first time at n = 100, which here is a(100) = 4.

EXTENSIONS

Terms up to n = 100 added by Antti Karttunen, Jun 22 2014

#42 by M. F. Hasler at Tue Jun 20 17:02:19 EDT 2023

COMMENTS

Left inverse of A007088, (binary numbers), cf. formula from Karttunen. - M. F. Hasler, Jun 13 2023

#41 by M. F. Hasler at Tue Jun 13 13:45:17 EDT 2023

COMMENTS

Left inverse of A007088, cf. formula from Karttunen. - M. F. Hasler, Jun 13 2023

STATUS

approved

editing

Discussion

Tue Jun 20

16:59

OEIS Server: This sequence has not been edited or commented on for a week
yet is not proposed for review.  If it is ready for review, please
visit https://oeis.org/draft/A028897 and click the button that reads
"These changes are ready for review by an OEIS Editor."

Thanks.
  - The OEIS Server

#40 by Jon E. Schoenfield at Fri Dec 17 00:54:06 EST 2021

STATUS

proposed

approved

#39 by Jon E. Schoenfield at Fri Dec 17 00:54:02 EST 2021

STATUS

editing

proposed

#38 by Jon E. Schoenfield at Fri Dec 17 00:53:54 EST 2021

FORMULA

a(n) = 2*a([floor(n/10])) + (n mod 10). - Henry Bottomley, Apr 20 2001

a(0) = 0, a(n) = 2*a(n/10) if n == 0 (mod 10), a(n) = a(n-1)+1 otherwise. - Benoit Cloitre, Dec 21 2002

AUTHOR

N. J. A. Sloane.

STATUS

approved

editing

#37 by M. F. Hasler at Tue Feb 19 09:26:07 EST 2019

STATUS

editing

approved

#36 by M. F. Hasler at Tue Feb 19 09:25:39 EST 2019

CROSSREFS

Cf. A249873. See also: , A072170.

#35 by M. F. Hasler at Tue Feb 19 09:24:17 EST 2019

FORMULA

a(n) = A072170(n,10). - M. F. Hasler, Feb 19 2019

CROSSREFS

Cf. A249873. See also: A072170.

This is column 10 of A072170.

Discussion

Tue Feb 19

09:25

M. F. Hasler: Oops,  A072170(n,10) is linked to records in A322000, not equal a(n).