248 (number)
248 (two hundred [and] forty-eight) is the natural number following 247 and preceding 249.
| ||||
|---|---|---|---|---|
| Cardinal | two hundred forty-eight | |||
| Ordinal | 248th (two hundred forty-eighth) | |||
| Factorization | 23 × 31 | |||
| Greek numeral | ΣΜΗ´ | |||
| Roman numeral | CCXLVIII, ccxlviii | |||
| Binary | 111110002 | |||
| Ternary | 1000123 | |||
| Senary | 10526 | |||
| Octal | 3708 | |||
| Duodecimal | 18812 | |||
| Hexadecimal | F816 | |||
Additionally, 248 is:
- a nontotient. [1]
- a refactorable number. [2]
- an untouchable number.[3]
- palindromic in bases 13 (16113), 30 (8830), 61 (4461) and 123 (22123).
- a Harshad number in bases 3, 4, 6, 7, 9, 11, 13 (and 18 other bases).
- part of the 43-aliquot tree. The aliquot sequence starting at 248 is: 248, 232, 218, 112, 136, 134, 70, 74, 40, 50, 43, 1, 0.
The exceptional Lie group E8 has dimension 248.
References
[edit]- ^ Sloane, N. J. A. (ed.). "Sequence A005277 (nontotients)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A033950 (refactorable numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005114 (Untouchable numbers: impossible values for sum of aliquot parts of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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