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## January 01, 2017

### 2017 will be a good year!

We all know that 2017 is a prime number, but it is more than just another prime number.

2017π (rounds to nearest integer) is a prime

2017e (rounds to nearest integer ) is a prime.

The sum of all odd primes up to 2017 is a prime number, i.e. 3+5+7+11+...+2017 is a prime number.

The sum of the cube of gap of primes up to 2017 is a prime number. That is (3-2)^3 + (5-3)^3 + (7-5)^3 + (11-7)^3 + ... + (2017-2011)^3 is a prime number.

The prime number before 2017 is 2017+(2-0-1-7), which makes it a sexy prime, and the prime after 2017 is 2017+(2+0+1+7). 2017 itself is of course equal to 2017+(2*0*1*7)

Insert 7 into any two digits of 2017, it is still a prime number, i.e. 27017, 20717, 20177 are all primes. Plus, 20177 is also a prime number

Since all digits of 2017 is less than 8, it can be viewed as an octal. 2017 is still a prime number as an octal.

2017 can be written as a sum of three cubes of primes, i,e, p^3 +q^3 +r^3 for some primes p, q, r.

2017 can be written as a sum of cubes of five distinct integers.

2017 can be written as x^2+y^2, x^2+2y^2, x^2+3y^2, x^2+4y^2 x^2+6y^2, x^2+7y^2, x^2+8y^2, x^2+9y^2 (for positive integers x, y)

20170123456789 is also a prime

the 2017th prime number is 17539 and 201717539 is also a prime.

Let p=2017, then both (p+1)/2 and (p+2)/3 are prime numbers.

The first ten digits of the decimal expansion of the cubic root of 2017 contains all different digits 0~9. 2017 is the least integer has this property.

2017 = 2^11 - 11th prime

(via Woz, via Shawn Nunley)

Posted by Snaggy at January 1, 2017 12:26 PM