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 A242347 Number of decimal digits of A008559. 2
 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. Code Golf StackExchange, Length of Binary as Base 10 [OEIS A242347], coding challenge started Oct 28 2022. 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 (PARI) a242347(n) = {my (k=2, d=digits); while(n--, k=fromdigits(d(k, 2))); #d(k)} \\ Hugo Pfoertner, Nov 04 2022 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 July 17 05:50 EDT 2024. Contains 374360 sequences. (Running on oeis4.)