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# 701

701, 7001, 70001, and 700001 are each prime. [Brown]

2^{701} + 701 is prime. [Honaker and
De Geest]

This prime can be written as 5^{4} + 4^{3} + 3^{2} + 2^{1} + 1^{0}. [Kulsha]

The number of named openings and variations listed in the 1987 edition of *The Oxford Companion to Chess* by Hooper and Whyld. [McCranie]

There are currently 701 types of pure breed dogs. [BBC]

The number of UFO cases that Project Blue Book left classified as "unknown." [McCranie]

The IBM 701 was the company's first production-line electronic digital computer. (It was announced to the public in 1952.)

Smallest prime whose square (701^2 = 491401) contains all of square digits only. [Gupta]

The smallest emirp *p* such that 2^{p}
has a sum of digits that is also an emirp (941). [Beedassy]

e (2.718...) to the power phi (Golden ratio 1.618...) is approximately 5. A much better approximation is given by 701/139, both numbers prime. [Menhinick]

If A=2, B=3, C=5, D=7, ... , Z=101, then 'AN ISOLATED PRIME NUMBER' is an isolated prime number. [Homewood]

701 decillion has a Collatz trajectory length of 701. [Gaydos]