A215733 a(n) is the first digit to appear n times in succession in a power of 3.

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

Offset: 1

Author

V. Raman, Aug 22 2012

Keywords

• nonn
• base
• more

Crossrefs

Cf. A215727, A045875, A215732.

Programs

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

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