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A065714 Number of 3's in decimal expansion of 2^n. 11
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 3, 0, 1, 1, 1, 1, 1, 0, 1, 0, 4, 1, 3, 0, 1, 0, 1, 1, 1, 0, 3, 1, 3, 0, 2, 0, 1, 2, 0, 1, 2, 2, 0, 2, 3, 0, 4, 1, 3, 1, 4, 2, 1, 1, 1, 2, 3, 2, 3, 1, 2, 4, 1, 4, 3, 0, 3, 2, 3, 4, 4, 3, 3, 2, 1, 3, 0, 0, 4, 2, 2, 6, 1, 4, 4, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,26
LINKS
EXAMPLE
2^5 = 32 so a(5)=1.
MATHEMATICA
Table[ Count[ IntegerDigits[2^n], 3], {n, 0, 100} ]
PROG
(PARI) a(n) = #select(x->(x==3), digits(2^n)); \\ Michel Marcus, Jun 15 2018
(Python)
def A065714(n):
return str(2**n).count('3') # Chai Wah Wu, Feb 14 2020
CROSSREFS
Cf. 0's A027870, 1's A065712, 2's A065710, 4's A065715, 5's A065716, 6's A065717, 7's A065718, 8's A065719, 9's A065744.
Sequence in context: A101949 A124796 A343858 * A110700 A338939 A292150
KEYWORD
nonn,base
AUTHOR
Benoit Cloitre, Dec 04 2001
EXTENSIONS
More terms from Robert G. Wilson v, Dec 07 2001
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)