A page of the Numeropedia - the Special Encyclopedia of Numbers
[Math.] Sum of the first 334 cube numbers:
13+…+3343 = 3,129,843,025 = (1+2+…+334)2 = 55,9452.
[Calendar] The average number of seconds in a century in a currently-used Gregorian year.
[Math.] Sum of the first 335 cube numbers:
13+…+3353 = 3,167,438,400 = (1+2+…+335)2 = 56,2802.
[Math.] 565322 = 3,195,867,024, a square number using each of 10 digits 0-9 once. (The 30th of 87 such numbers).
[Math.] For any x,yzw = 1000 to 9999, there are always six 6-digit numbers abc,edf such that x,yzw +abc,def is equal to one of 6 digit-rotations of 142,857 and the number x,yzw,abc,def is a multiple of 142,857.
For any x,yzw = 1000 to 9999, there are always twelve 6-digit numbers abc,edf such that x,yzw +abc,def is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number x,yzw,abc,def is a multiple of 76,923.