244 (number)
244 (two hundred [and] forty-four) is the natural number following 243 and preceding 245.
| ||||
|---|---|---|---|---|
| Cardinal | two hundred forty-four | |||
| Ordinal | 244th (two hundred forty-fourth) | |||
| Factorization | 22 × 61 | |||
| Prime | no | |||
| Greek numeral | ΣΜΔ´ | |||
| Roman numeral | CCXLIV | |||
| Binary | 111101002 | |||
| Ternary | 1000013 | |||
| Senary | 10446 | |||
| Octal | 3648 | |||
| Duodecimal | 18412 | |||
| Hexadecimal | F416 | |||
Additionally, 244 is:
- the sum of two nonzero fifth powers (244 = 1 + 243 = 15 + 35).[1]
- palindromic in bases 3 (1000013), 11 (20211), 60 (4460), 121 (22121), 243 (11243).
- a Harshad number in bases 3, 9, 11, 61, 62, 81, 121, 122, 123 and 184.
- the second anti-perfect number, meaning that reversing the digits of the proper divisors of 244 and adding the results gives 244 back again.[2]
- part of the sequence 1, 2, 4, 8, 61, 221, 244, ... in which each number is formed by reversing the digits of the double of the previous number.[3]
- the number of non-isomorphic set-systems of weight 8
References
[edit]- ^ Sloane, N. J. A. (ed.). "Sequence A020896 (Positive numbers n such that n = x^5 + y^5 has a solution in nonzero integers x, y)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A072228 (Numbers n such that n = the sum of the reverses of the proper divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A036447 (Double and reverse digits)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.