78, 156, 234, 312, 390, 468, 546, 624, 702, 780, 858, . . .
The common multiples of 6 and 13 are the infinite set of multiples of their LCM, which is 78. So the common multiples of 6 and 13 are 78, 156, 234, 312, 390, and so on.
Multiples of 78.
Factors: 1, 2, 3, 6, 13, 26, 39, 78 Multiples: 78, 156, 234 and so on.
The number of multiples is infinite, starting with: 78, 156, 234, 312, 390, 468, 546, 624, 702 +78 . . .
78 and any of its multiples
78, 156, 234, 312, 390
Factors: 1,3,13,39 Multiples: 39, 78, 117 and so on.
All multiples of 78 are divisible by it. For example ( 78 X 2, 156) or (78 x 3 , 234) etc.
26, 52, 78 for example.
Itself and any of its multiples
That's an infinite list.
26, 52, 78 and so on.