1721

1721 is a Prime Number, Prime(268)

1721 = 1 × 2³ × 4 + 5 × 6 × 7 × 8 + 9

1721 = 9 + (8 + 76) × 5 × 4 + 32 × 1

1721 = 0^6 + 1^9 + 2^7 − 3^8 + 4^5 + 5^0 + 6^1 + 7^2 + 8^3 + 9^4

1721 = 11^2 + 40^2

1721^2 = 880^2 + 1479^2

Lesser of Twin Prime Pair

1721 is an irregular prime, since it divides the numerator of the Bernoulli number B30

a(n) = n + (n+1)^2, n = 40

Factors: 1, 1721

Representations, Binary to Hexadecimal:

11010111001_2
2100202_3
122321_4
23341_5
11545_6
5006_7
3271_8
2322_9
1325_11
bb5_12
a25_13
8ad_14
79b_15
6b9_16

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