The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A102669

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A102669

Number of digits >= 2 in decimal representation of n.
(history; published version)

#28 by Michael De Vlieger at Sun Feb 19 15:47:58 EST 2023

STATUS

reviewed

approved

#27 by Amiram Eldar at Sun Feb 19 15:01:11 EST 2023

STATUS

proposed

reviewed

#26 by Jon E. Schoenfield at Sun Feb 19 14:54:37 EST 2023

STATUS

editing

proposed

#25 by Jon E. Schoenfield at Sun Feb 19 14:54:35 EST 2023

FORMULA

G.f.: g(x) = (1/(1-x))*sum_Sum_{j>=0} (x^(d*10^j) - x^(10*10^j))/(1 - x^10^(j+1)). (End)

STATUS

proposed

editing

#24 by Bernard Schott at Sun Feb 19 14:21:57 EST 2023

STATUS

editing

proposed

#23 by Bernard Schott at Sun Feb 19 13:53:38 EST 2023

CROSSREFS

Cf. A000120, A000788, A007088, A023416, A059015 (for base 2).

Discussion

Sun Feb 19

14:21

Bernard Schott: One comment.

#22 by Bernard Schott at Sun Feb 19 13:51:53 EST 2023

COMMENTS

a(n) = 0 iff n is in A007088 (numbers in base 2). - Bernard Schott, Feb 19 2023

STATUS

approved

editing

#21 by N. J. A. Sloane at Thu Aug 17 22:28:37 EDT 2017

STATUS

proposed

approved

#20 by Michael De Vlieger at Thu Aug 17 22:26:48 EDT 2017

STATUS

editing

proposed

#19 by Michael De Vlieger at Thu Aug 17 22:26:46 EDT 2017

MATHEMATICA

Table[Total@ Take[DigitCount@ n, {2, 9}], {n, 0, 104}] (* Michael De Vlieger, Aug 17 2017 *)

STATUS

proposed

editing