Solve these number pattern problems: a) Count in 3s, start with an even number < 3. b) Input 1, 2, 3, 4, 5; Rule x10. c) Input 1, 3, 4, 5, 7; Rule x8.

The only even number smaller than 3 is 2.

The pattern is $\boxed{\text{2, 5, 8, 11, ...}}$

For input 1: $1 \times 10 = 10$
For input 2: $2 \times 10 = 20$
For input 3: $3 \times 10 = 30$
For input 4: $4 \times 10 = 40$
For input 5: $5 \times 10 = 50$
The output numbers are $\boxed{\text{10, 20, 30, 40, 50}}$

For input 1: $1 \times 8 = 8$
For input 3: $3 \times 8 = 24$
For input 4: $4 \times 8 = 32$
For input 5: $5 \times 8 = 40$
For input 7: $7 \times 8 = 56$
The output numbers are $\boxed{\text{8, 24, 32, 40, 56}}$