| 词条 | 202 (number) |
| 释义 |
| number = 202 | divisor = 1, 2, 101, 202 }} 202 (two hundred [and] two) is the natural number following 201 and preceding 203. In mathematics202 is a Smith number, meaning that its digit sum and the sum of digits of its prime factors are equal.[1] It is also a strobogrammatic number, meaning that when shown on a seven-segment display, turning the display upside-down shows the same number.[2] There are exactly 202 partitions of 32 (a power of two) into smaller powers of two.[3] There are also 202 distinct (non-congruent) polygons that can be formed by connecting all eight vertices of a regular octagon into a cycle,[4] and 202 distinct (non-isomorphic) directed graphs on four unlabeled vertices, not having any isolated vertices.[5] See also
References1. ^{{Cite OEIS|A006753|name= Smith (or joke) numbers}} {{Integers|2}}{{DEFAULTSORT:202 (Number)}}2. ^{{Cite OEIS|A018846|name=Strobogrammatic numbers}} 3. ^{{Cite OEIS|A002577|name=Number of partitions of 2^n into powers of 2}} 4. ^{{Cite OEIS|A000940|name=Number of n-gons with n vertices}} 5. ^{{Cite OEIS|A053598|name=Number of n-node unlabeled digraphs without isolated nodes}} 1 : Integers |
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