238 (number)
238 (two hundred [and] thirty-eight) is the natural number following 237 and preceding 239.
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| Cardinal | two hundred thirty-eight | |||
| Ordinal | 238th (two hundred thirty-eighth) | |||
| Factorization | 2 × 7 × 17 | |||
| Prime | no | |||
| Greek numeral | ΣΛΗ´ | |||
| Roman numeral | CCXXXVIII | |||
| Binary | 111011102 | |||
| Ternary | 222113 | |||
| Octal | 3568 | |||
| Duodecimal | 17A12 | |||
| Hexadecimal | EE16 | |||
238 is an untouchable number.[1] There are 238 2-vertex-connected graphs on five labeled vertices,[2] and 238 order-5 polydiamonds (polyiamonds that can partitioned into 5 diamonds).[3] Out of the 720 permutations of six elements, exactly 238 of them have a unique longest increasing subsequence.[4]
References
- 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.
- Sloane, N. J. A. (ed.). "Sequence A013922 (Number of labeled connected graphs with n nodes and 0 cutpoints (blocks or nonseparable graphs))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- Sloane, N. J. A. (ed.). "Sequence A056844 (Number of polydiamonds: polyominoes made from n diamonds)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- Sloane, N. J. A. (ed.). "Sequence A167995 (Total number of permutations on {1,2,...,n} that have a unique longest increasing subsequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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