An Armstrong number is a positive m-digit number that is equal to the sum of the mth powers of their digits. It is also known as pluperfect, or Plus Perfect, or Narcissistic number. It is an OEIS sequence A005188. Let’s understand it through an example.
1: 1¹ = 1
2: 2¹ = 2
3: 3¹ = 3
153: 1³ + 5³ + 3³ = 1 + 125+ 27 = 153
125: 1³ + 2³ + 5³ = 1 + 8 + 125 = 134 (Not an Armstrong Number)
1634: 1⁴ + 6⁴ + 3⁴ + 4⁴ = 1 + 1296 + 81 + 256 = 1643
Similarly, we can check other number also.
The first few Armstrong numbers between 0 to 999 are 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407. Some other Armstrong numbers are 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725, 4210818, 9800817, 9926315, 24678050, 24678051, 88593477, 146511208, 472335975, 534494836, 912985153, 4679307774, 32164049650, 32164049651.
📝 Note: There is no two-digit Armstrong number.
| Sl. No. | Name | Path | Completed |
|---|---|---|---|
| 1. | Amicable Number Checking | Armstsrong_Number_Check.java | ✅ |
| 2. | Armstsrong Number Series | Armstsrong_Number_Series.java | ✅ |