The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 2 |
| 4 | 3 |
| 5 | 2 |
| 6 | 3 |
| 7 | 2 |
| 8 | 3 |
| 9 | 2 |
| 10 | -1 |
| 11 | -1 |
| 12 | -1 |
| 13 | -1 |
| 14 | 13 |
| 15 | -1 |
| 16 | -1 |
| 17 | -1 |
| 18 | 5 |
| 19 | -1 |
| 20 | -1 |
| 21 | -1 |
| 22 | 9 |
| 23 | 12 |
| 24 | 16 |
| 25 | 14 |
| 26 | -1 |
| 27 | -1 |
| 28 | -1 |
| 29 | -1 |
| 30 | -1 |
| 31 | -1 |
| 32 | 17 |
| 33 | 18 |
| 34 | -1 |
| 35 | -1 |
| 36 | -1 |
| 37 | -1 |
| 38 | 20 |
| 39 | -1 |
| 40 | 13 |
| 41 | 20 |
| 42 | -1 |
| 43 | -1 |
| 44 | -1 |
| 45 | -1 |
| 46 | -1 |
| 47 | -1 |
| 48 | 22 |
| 49 | 18 |
| 50 | -1 |
| 51 | -1 |
| 52 | 19 |
| 53 | -1 |
| 54 | -1 |
| 55 | -1 |
| 56 | -1 |
| 57 | -1 |
| 58 | -1 |
| 59 | 28 |
| 60 | -1 |
| 61 | -1 |
| 62 | 32 |
| 63 | -1 |
| 64 | -1 |
| 65 | 24 |
| 66 | -1 |
| 67 | -1 |
| 68 | -1 |
| 69 | -1 |
| 70 | -1 |
| 71 | -1 |
| 72 | 22 |
| 73 | -1 |
| 74 | -1 |
| 75 | -1 |
| 76 | -1 |
| 77 | 30 |
| 78 | -1 |
| 79 | -1 |
| 80 | -1 |
| 81 | -1 |
| 82 | 28 |
[2,3,2,3,2,3,2,3,2,-1,-1,-1,-1,13,-1,-1,-1,5,-1, -1,-1,9,12,16,14,-1,-1,-1,-1,-1,-1,17,18,-1,-1,-1, -1,20,-1,13,20,-1,-1,-1,-1,-1,-1,22,18,-1,-1,19, -1,-1,-1,-1,-1,-1,28,-1,-1,32,-1,-1,24,-1,-1,-1, -1,-1,-1,22,-1,-1,-1,-1,30,-1,-1,-1,-1,28] |