51 = 123 + 4 × 5 + 6 + 7 + 8 + 9
51 = 9 + 87 − 65 − 4 + 3 + 21
51 = 0^8 − 1^0 + 2^7 − 3^9 + 4^5 + 5^6 + 6^2 + 7^4 + 8^3 + 9^1
51 = (11 − 1)(1+1)/(1 + 1) + 1
= 2 × (22 + 2) + 2 + 2/2
= 33 + 33 − 3
= 4 + 4 + 44 − 4/4
= 55 − 5 + 5/5
= 6 − 66 + 666/6
= 7 × 7 + (7 + 7)/7
= 8 × 8 − 8 − 8 − 8 + 88/8
= (999 − 9 × 9)/(9 + 9)
Numbers of edges of regular polygon constructible with unmarked straightedge and compass.
The ring of integers of the field Q(sqrt(-51)) has class number 2.
Semiprime (Product of 2 Primes)
Factors: 1, 3, 17, 51
Fifty-one
Representations, Binary to Hexadecimal:
110011_2
1220_3
303_4
201_5
123_6
102_7
63_8
56_9
47_11
43_12
3c_13
39_14
36_15
33_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
