4009 = 1 + 2 × 3 × 45 + 6 × 7 × 89
4009 = (9 × 87 + 6) × 5 + 43 + 21
4009 = 0^2 + 1^7 + 2^8 − 3^9 + 4^5 + 5^6 + 6^3 + 7^0 + 8^1 + 9^4
a(n) = (2*n - 1)*(7*n^2 - 7*n + 3)/3. n = 10
Semiprime (Product of 2 Primes)
Factors: 1, 19, 211, 4009
Representations, Binary to Hexadecimal:
111110101001_2
12111111_3
332221_4
112014_5
30321_6
14455_7
7651_8
5444_9
3015_11
23a1_12
1a95_13
1665_14
12c4_15
fa9_16
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