1285 = 1 + 234 × 5 + 6 × 7 + 8 × 9
1285 = ((9 + 8 × 7 + 6) × (5 + 4) + 3) × 2 + 1
1285 = 0^7 + 1^9 + 2^6 − 3^8 + 4^5 + 5^3 + 6^1 + 7^0 + 8^2 + 9^4
1285 = 14^2 + 33^2 = 18^2 + 31^2
1285^2 = 637^2 + 1116^2 = 893^2 + 924^2
1285 divides 16^4 - 1.
Sum of 10 nonzero 8th powers.
Numbers of edges of regular polygon constructible with unmarked straightedge and compass.
Moser-de Bruijn sequence: sums of distinct powers of 4.
Semiprime (Product of 2 Primes)
Factors: 1, 5, 257, 1285
Representations, Binary to Hexadecimal:
10100000101_2
1202121_3
110011_4
20120_5
5541_6
3514_7
2405_8
1677_9
a69_11
8b1_12
77b_13
67b_14
5aa_15
505_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
