

A215733


a(n) is the first digit to appear n times in succession in a power of 3.


14



1, 7, 8, 5, 5, 8, 2, 1, 2, 2, 2, 4, 5, 8, 2, 4, 4
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..17.


PROG

(Python)
def A215733(n):
....l, x = [str(d)*n for d in range(10)], 1
....for m in range(10**9):
........s = str(x)
........for k in range(10):
............if l[k] in s:
................return k
........x *= 3
....return 'search limit reached'
# Chai Wah Wu, Dec 17 2014


CROSSREFS

Cf. A215727, A045875, A215732.
Sequence in context: A217516 A071420 A031139 * A226750 A021564 A021060
Adjacent sequences: A215730 A215731 A215732 * A215734 A215735 A215736


KEYWORD

nonn,base,more


AUTHOR

V. Raman, Aug 22 2012


EXTENSIONS

a(12) from Chai Wah Wu, Dec 17 2014
a(13)a(14) from Giovanni Resta, Apr 20 2016
a(15) from Bert Dobbelaere, Mar 04 2019
a(16)a(17) from Bert Dobbelaere, Mar 20 2019


STATUS

approved



