14 ... 15 ... 16
20 ... 21 ... 22
24 ... 25 ... 26
25 ... 26 ... 27
26 ... 27 ... 28
32 ... 33 ... 34
33 ... 34 ... 35
34 ... 35 ... 36
38 ... 39 ... 40
44 ... 45 ... 46
48 ... 49 ... 50
49 ... 50 ... 51
50 ... 51 ... 52
54 ... 55 ... 56
55 ... 56 ... 57
56 ... 57 ... 58
.
.
.
etc.
Every even two-digit number is composite, so to have three consecutive two-digit composite numbers, all you need is an odd composite number and then the even number on either side of it. The odd composite two-digit numbers are 15, 21, 25, 27, 33, 35, 39, 45, 49, 51, 55, 57, 63, 65, 69, 75, 77, 81, 85, 87, 91, 93, and 95.
A far more interesting question is what are the seven consecutive two-digit composite numbers. The only answer is 90, 91, 92, 93, 94, 95, and 96.
102
24, 25 and 26 is one possible triplet.
8, 9, 10
Basically, composite numbers are the non-prime numbers. Take a table of prime numbers, and look for any two prime numbers, one after the other, that have a difference greater than 2. Any numbers in between are consecutive composite numbers. For example, the next prime number after 13 is 17; that makes 14, 15, and 16 three consecutive non-primes, i.e., composite numbers.
123
It's divisible by three, since the sum of its digits is divisible by three. So it's composite.
A number is called a staircase composite number when it has three prime factors that have different sized digits: the first is one digit, the second is two digits and the third is three digits. For example: [7] [41] [271] x 77 777 77 777 would be the staircase composite number.
102
267 is a composite number - since the digits of the number add up to a multiple of three, it is divisible by 3. Its prime factorization is 3 x 89 = 267.
it is 10
24, 25 and 26 is one possible triplet.
The four smallest three digit composite numbers are: 100, 102, 104, 105 with sum 411.
8, 9, 10
8, 9, 10
Basically, composite numbers are the non-prime numbers. Take a table of prime numbers, and look for any two prime numbers, one after the other, that have a difference greater than 2. Any numbers in between are consecutive composite numbers. For example, the next prime number after 13 is 17; that makes 14, 15, and 16 three consecutive non-primes, i.e., composite numbers.
123
There are no such numbers. The smallest set of three consecutive composite numbers is {8, 9, 10} and the product of these numbers is 720.