The 61st Fibonacci number (2504730781961) is the smallest Fibonacci number that contains all the digits from 0 to 9.
61 is the smallest prime whose reversal (16) is a square.
There are 61 abstract groups of order 1464. Note that 61 divides 1464.
59 and 61 are twin primes.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB6uCgqA5qHn_e3B3kNHtp389HOmrSNZ8lu6uWnAo8dfGmJ6AcktzcSZALL-D2KJZDVRWemzAoHvcn5CZ3WuaSPqdSACLiSXU6UUXCkAcU8-lufClq7ZU1Sgv7tiHLEqmOS-5npmpFJ7A/s200/n0061+copy.jpg)
The official length of an ice hockey rink must be no more than 61 meters.
Source: Number Gossip
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB6uCgqA5qHn_e3B3kNHtp389HOmrSNZ8lu6uWnAo8dfGmJ6AcktzcSZALL-D2KJZDVRWemzAoHvcn5CZ3WuaSPqdSACLiSXU6UUXCkAcU8-lufClq7ZU1Sgv7tiHLEqmOS-5npmpFJ7A/s200/n0061+copy.jpg)
The official length of an ice hockey rink must be no more than 61 meters.
Source: Number Gossip
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