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A242347 Number of decimal digits of A008559. 1
1, 2, 4, 10, 31, 100, 330, 1093, 3628, 12049, 40023, 132951, 441651, 1467130, 4873698, 16190071, 53782249, 178660761, 593498199, 1971558339 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n+1)/a(n) is approximately log_2(10) = A020862. - André Engels, Apr 01 2021

LINKS

Table of n, a(n) for n=1..20.

FORMULA

a(n) = A055642(A008559(n)). - Michel Marcus, May 11 2014

EXAMPLE

a(3) = 4 because 1010 has 4 decimal digits.

PROG

(Python)

A242347_list, l = [1], 2

for _ in range(10):

....l = int(bin(l)[2:])

....A242347_list.append(len(str(l))) # Chai Wah Wu, Dec 26 2014

CROSSREFS

Cf. A008559, A055642, A020862.

Sequence in context: A001647 A007177 A328815 * A138415 A005268 A243931

Adjacent sequences:  A242344 A242345 A242346 * A242348 A242349 A242350

KEYWORD

nonn,base,more

AUTHOR

J. Lowell, May 11 2014

EXTENSIONS

a(1), a(18)-a(20) from Chai Wah Wu, Dec 26 2014

STATUS

approved

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Last modified May 12 23:35 EDT 2021. Contains 343829 sequences. (Running on oeis4.)