A353147 Decimal repunits written in base 8.

0, 1, 13, 157, 2127, 25547, 331007, 4172107, 52305307, 647665707, 10216432707, 122621414707, 1473657200707, 20126330410707, 241540165130707, 3120702223570707, 37450626705270707, 473627744665470707, 6125757360430070707, 75533532545361070707

Offset: 0

Author

Seiichi Manyama, Apr 26 2022

Keywords

• nonn
• base
• easy

Crossrefs

Cf. A002275, A291962, A353142, A353143, A353144, A353145, A353146, A353148.

Cf. A007094, A023001.

Programs

PARI

a(n) = fromdigits(digits((10^n-1)/9, 8));

Python

def a(n): return 0 if n == 0 else int(oct(int("1"*n))[2:])
print([a(n) for n in range(13)]) # Michael S. Branicky, Apr 26 2022

Formula

a(n) = A007094(A002275(n)).