10

10 = 2 × 5

10 = 1^2345678 + 9

10 = 98 − 7 + 6 − 54 − 32 − 1

10 = −0^0 − 1^8 − 2^7 − 3^9 + 4^5 + 5^6 + 6^2 + 7^4 + 8^1 + 9^3

10 = 1³ + 1³ + 2³ is the sum of 3 positive cubes in exactly 1 way

10 = 1^2 + 3^2

10 = 4 ÷√4 + 4 ×√4 = (44 − 4) ÷ 4

10 = 2 + 3 + 5, Sum of the first 3 primes

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 and 5 + 5 = 10 = 1 + 2 + 3 + 4 (tetraktys)

Sum of 10 nonzero 8th powers.

10 smallest number with 2 representations as a sum of 2 primes: 10 = 3 + 7 = 5 + 5

10 = binomial(4 + 1, 2) is the 4th triangular number.

10 = binomial(3 + 2, 3) is the 3rd tetrahedral number.

Smallest number of multiplicative persistence 1

Numbers k such that 2^k + 9 is prime. (1033)

Numbers k such that (8*10^k + 49)/3 is prime.

Number k such that 4^k + 13 is prime.

Numbers k such that k^2 divides 9^k - 1 (3486784400)

Numbers of edges of regular polygon constructible with unmarked straightedge and compass.

Semiprime (Product of 2 Primes)

Factors: 1, 2, 5, 10

Ten

Representations, Binary to Hexadecimal:

1010_2
101_3
22_4
20_5
14_6
13_7
12_8
11_9
a_11
a_12
a_13
a_14
a_15
a_16

9 <--- ---> 11