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

0,3

Links

Table of n, a(n) for n=0..19.

Formula

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

Prog

(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

Crossrefs

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

Cf. A007094, A023001.

Sequence in context: A125470 A165151 A016125 * A175519 A015470 A084328

Adjacent sequences: A353144 A353145 A353146 * A353148 A353149 A353150

Keyword

nonn,base,easy

Author

Seiichi Manyama, Apr 26 2022

Status

approved