169

169 = 13 × 13

169 = 1 + 23 × 4 + 5 + 6 + 7 × 8 + 9

169 = 9 × 8 + 7 + 65 + 4 × 3 × 2 + 1

169 = 0^6 + 1^8 − 2^9 − 3^7 + 4^5 + 5^2 + 6^4 + 7^0 + 8^3 + 9^1

169 = 13^2

169 = 5^2 + 12^2

169^2 = 119^2 + 120^2

169 divides 22^3 - 1.

169 = (11 + 1 + 1)⁽¹⁺¹⁾

169 = (2 + 22/2)²

169 = (3 + 3) × 3³ + 3 + 3 + 3/3

169 = 4 × 44 + 4 − 44/4

169 = 55 × 5 + 5 − 555/5

169 = (6 + 6 + 6/6)^((6+6)/6)

169 = 77 + 77 + 7 + 7 + 7/7

169 = 88 + 88 − 8 + 8/8

169 = 9 × 9 + 99 − 99/9

a(n) = n^2 written backwards. (961 = 31²)

Pell number: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2*a(n-1) + a(n-2). (n=7)

Semiprime (Product of 2 Primes)

a(n) is the smallest semiprime such that difference between a(n) and next semiprime, b(n), is n, n = 8

Factors: 1, 13, 169

One hundred sixty-nine

Representations, Binary to Hexadecimal:

10101001_2
20021_3
2221_4
1134_5
441_6
331_7
251_8
207_9
144_11
121_12
100_13
c1_14
b4_15
a9_16

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