Answer
O45 = 5,985
↓Steps Explained:↓
Calculate octagonal number 45
Octagonal Numbers form dots in the shape of an octagon.
Octagonal Number Image:
Octagonal Number Formula:
On = n(3n - 2)
Given n = 45, we have:
O45 = 45(3(45) - 2)
O45 = 45(135 - 2)
O45 = 45(133)
O45 = 5,985Octagonal Number List 1 - 45
| 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 |
| 31 | 2821 |
| 32 | 3008 |
| 33 | 3201 |
| 34 | 3400 |
| 35 | 3605 |
| 36 | 3816 |
| 37 | 4033 |
| 38 | 4256 |
| 39 | 4485 |
| 40 | 4720 |
| 41 | 4961 |
| 42 | 5208 |
| 43 | 5461 |
| 44 | 5720 |
| 45 | 5985 |
Related Calculators: Division Equality Property | Whole Numbers | Associative Property