0, 1, 2, 3,
10, 11, 12, 13,
20, 21, 22, 23,
30, 31, 32, 33,
100, 101, 102, 103,
110
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1+3+6+10 =20
The list of numbers that are divisible by five is infinite. The first four are: 5, 10, 15, 20 . . .
The first 20 odd numbers are: 13579111315171921232527293133353739.
18,19,21,22.
There are four prime numbers between 20 and 40