123
234
123, 234, 345, 456, 567, 678 sorry if this wasn't what you were looking for but consecutive numbers are just numbers that come next to each other there isn't really a pattern.
345 x 456 = 157320
456 - 234 = 222
234 x 345 = 80,730
123 x 456 = 56,088
123 + 456 = 579
234 x 123 = 28782
123 + 345 = 468
468
123 + 456 + 7890 = 8469