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A004221 a(n) = ceiling(10*log_10(n)). 3
0, 4, 5, 7, 7, 8, 9, 10, 10, 10, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
Ceiling[10*Log[10, Range[60]]] (* Harvey P. Dale, Apr 21 2013 *)
CROSSREFS
Sequence in context: A151551 A021690 A109896 * A239504 A033557 A259600
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified July 22 06:32 EDT 2024. Contains 374481 sequences. (Running on oeis4.)