99 is a Kaprekar number, 98 + 01 = 99 and 992 = 9801
1/ 99 = 0101010101010101010101....
995 = 65+175+605+645+735+895
99 = 1 + 2 + 3 + 4 + 5 + 67 + 8 + 9
99 = 9 + 8 + 7 + 65 + 4 + 3 + 2 + 1
99 = 0^5 + 1^9 − 2^7 − 3^8 + 4^6 + 5^0 + 6^3 + 7^4 + 8^2 + 9^1
99 = 11 × (11 − 1 − 1)
99 = (22/2)2 − 22
99 = 3 × 33
99 = 4 − 4 × 4 + 444/4
99 = 5 × (5 × 5 − 5) − 5/5
99 = 666/6 − 6 − 6
99 = 7 × (7 + 7) + 7/7
99 = 88 + 88/8
Number k such that k^2 + 2 is prime
Number of knapsack partitions of 20
Number of edges in an equilateral triangle when n internal equilateral triangles are drawn between the 3n points that divide each side into n+1 equal parts. (n=4)
Maximal number of regions obtained by joining 8 points around a circle by straight lines
Smallest number whose sum of digits is 18.
Ninety-nine
Representations, Binary to Hexadecimal:
1100011_2
10200_3
1203_4
344_5
243_6
201_7
143_8
120_9
90_11
83_12
78_13
71_14
69_15
63_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
