A197308 -id:A197308 - cp's OEIS frontend

A197309 Divisors of the 9th repunit 111111111.

1, 3, 9, 37, 111, 333, 333667, 1001001, 3003003, 12345679, 37037037, 111111111

Offset: 1

M. F. Hasler, Oct 13 2011

The prime factorization of (10^9 - 1)/9 is 3^2 * 37 * 333667. - Alonso del Arte, Apr 27 2014

Index entries for sequences related to divisors of numbers.

Cf. A109492, A197308, A070529, A018282, A018766, A027894, A027893, A027892, A027891, A027890, A027889, A027895.

Divisors[(10^9 - 1)/9] (* Alonso del Arte, Apr 27 2014 *)

divisors(10^9\9) \\ Charles R Greathouse IV, Jun 21 2017

A197318 Divisors of the repunit 111111111111 = A002275(12).

Original entry on oeis.org

1, 3, 7, 11, 13, 21, 33, 37, 39, 77, 91, 101, 111, 143, 231, 259, 273, 303, 407, 429, 481, 707, 777, 1001, 1111, 1221, 1313, 1443, 2121, 2849, 3003, 3333, 3367, 3737, 3939, 5291, 7777, 8547, 9191, 9901, 10101, 11211, 14443, 15873, 23331, 26159, 27573, 29703

Offset: 1

M. F. Hasler, Oct 13 2011

The sequence is marked "full" since even though they don't fit into the three lines above, all 128 terms are known and available in the b-file or using the given PARI code.

M. F. Hasler, Table of n, a(n) for n = 1..128 (complete sequence)
Index entries for sequences related to divisors of numbers.

Cf. A109492, A197308, A197309, A070529, A018282, A018766, A027890-A027895, A027889.

Divisors[111111111111] (* Paolo Xausa, Jul 04 2024 *)

PARI
```
divisors(1e12\9)
```

cp's OEIS Frontend

A197309 Divisors of the 9th repunit 111111111.

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