One possible rule is
Un = (-1493n3 + 13443n2 - 38890n + 36024)/6 for n = 1, 2, 3, 4.
2 by 7 of 21
There are 16 subsets: {0, 5, 7, 12}, {0, 5, 7}, {0, 5, 12}, {0, 7, 12}, {5, 7, 12}, {0, 5}, {0, 7}, {0, 12}, {5, 7}, {5, 12}, {7, 12}, {0], {5}, {7}, {12}, and the empty set.
If a number ends with 0, it is divisible by 10. If a number ends with 5 or 0, it is divisible by 5.
The rule is (-2, -5)
if the number ends on 5 or 0 the number is divisible by 5
If the number ends in 5 or 0 the whole number is divisible by 5.
There are 16 subsets: {0, 5, 7, 12}, {0, 5, 7}, {0, 5, 12}, {0, 7, 12}, {5, 7, 12}, {0, 5}, {0, 7}, {0, 12}, {5, 7}, {5, 12}, {7, 12}, {0], {5}, {7}, {12}, and the empty set.
Any number ending with 0 or 5 is a multiple of 5 except 0 itself.
If a number ends with 0, it is divisible by 10. If a number ends with 5 or 0, it is divisible by 5.
The rule is (-2, -5)
If the number ends in 5 or 0 the whole number is divisible by 5.
if the number ends on 5 or 0 the number is divisible by 5
The numerical value of each of these numbers is obtained by summing them together: 2 + 7 + 0 - 1 - 7 + 5 - 5 + 13 + 12 - 14 = 12
The ISBN of Wizard's First Rule is 0-312-85705-5.
If the number ends in 5 or 0 the whole number is divisible by 5.
Distance from (0, 0) to (5, 12) using distance formula is 13
all numbers whose last digits are 5 and 0
1, 2, 5, 10, 757, 1514, 3785, 7570