Answer
O30 = 2,640
↓Steps Explained:↓
Calculate octagonal number 30
Octagonal Numbers form dots in the shape of an octagon.
Octagonal Number Image:
Octagonal Number Formula:
On = n(3n - 2)
Given n = 30, we have:
O30 = 30(3(30) - 2)
O30 = 30(90 - 2)
O30 = 30(88)
O30 = 2,640Octagonal Number List 1 - 30
| n | Octagonal number On |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 21 |
| 4 | 40 |
| 5 | 65 |
| 6 | 96 |
| 7 | 133 |
| 8 | 176 |
| 9 | 225 |
| 10 | 280 |
| 11 | 341 |
| 12 | 408 |
| 13 | 481 |
| 14 | 560 |
| 15 | 645 |
| 16 | 736 |
| 17 | 833 |
| 18 | 936 |
| 19 | 1045 |
| 20 | 1160 |
| 21 | 1281 |
| 22 | 1408 |
| 23 | 1541 |
| 24 | 1680 |
| 25 | 1825 |
| 26 | 1976 |
| 27 | 2133 |
| 28 | 2296 |
| 29 | 2465 |
| 30 | 2640 |
Related Calculators: Division Equality Property | Whole Numbers | Associative Property