2015 is palindromic in base 2 (binary): 11111011111 (A030130 and A168355). 2015 repeats the string 133 in base 4: 133133 (A020332). It repeats the string 37 in base 8: 3737 (A020336).
2015 is a Lucas-Carmichael number (A006972 and A129868).
2014, 2015, and 2016 each have three distinct prime factors (sphenic numbers) (A168626).
2015 is the sum of 10 distinct powers of 2 (A038461).
2015 is a number that cannot be written as a sum of three squares.
2015 divides 924 - 1.
2015 is a year with exactly three "Friday the 13ths" (A190653).
2015 is a year in which a blue moon occurs (a second full month to occur in a single calendar month) (A125680).
The year 2015 is the 100th anniversary of the founding of the Mathematical Association of America.
Source: OEIS
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