245 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred forty-five | |||
| Ordinal | 245th (two hundred forty-fifth) | |||
| Factorization | 5 × 72 | |||
| Greek numeral | ΣΜΕ´ | |||
| Roman numeral | CCXLV, ccxlv | |||
| Binary | 111101012 | |||
| Ternary | 1000023 | |||
| Senary | 10456 | |||
| Octal | 3658 | |||
| Duodecimal | 18512 | |||
| Hexadecimal | F516 | |||
245 (two hundred [and] forty-five) is the natural number following 244 and preceding 246.
Additionally, 245 is:
- a composite number.
- a stella octangula number. [1]
- palindromic in bases 34 (7734) and 48 (5548)[2]
- a Harshad number in bases 7, 9, 11, 15, 31, 35, 36 (and 14 other bases).[3]
- the aliquot sum of any of these numbers: 723, 1195, 2563, 3859,[4] 9259, 10123, 12283, 14659 and 14803
- part of the 97-aliquot tree.[4] The aliquot sequence starting at 10222 is: 10222, 5978, 4624, 4893, 2595, 1581, 723, 245[4], 97, 1, 0
References
- ^ Sloane, N. J. A. (ed.). "Sequence A007588 (stella octangula numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Double Base Palindrome". GeeksforGeeks. 2017-11-01. Retrieved 2021-09-13.
- ^ "Harshad (Or Niven) Number". GeeksforGeeks. 2016-11-19. Retrieved 2021-09-13.
- ^ a b c Mathar, Richard J. (21 March 2014). "Illustration of Aliquot Sequence Mergers" (PDF). oeis.org. Archived (PDF) from the original on 2 August 2021. Retrieved 2 August 2021.