489 = 123 + 45 × 6 + 7 + 89
489 = 98 + 76 × 5 + 4 + 3 × 2 + 1
489 = 0^4 − 1^8 + 2^6 − 3^9 + 4^7 + 5^5 + 6^1 + 7^0 + 8^3 + 9^2
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=9)
Semiprime (Product of 2 Primes)
Semiprime s such that s-/+2 are primes.
Factors: 1, 3, 163, 489
Representations, Binary to Hexadecimal:
111101001_2
200010_3
13221_4
3424_5
2133_6
1266_7
751_8
603_9
405_11
349_12
2b8_13
26d_14
229_15
1e9_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
