What is the next number in the following series ? 67, 137, 837, 1537, 8537, 15537, ?

Answer 1

85537
Add 7 to the first digit

Answer 2

Ans is 85537
Last four digits of previous number remain same
First digit is equal to sum of 1st and last digit of previous number

Answer 3

67 is 2 digit so
After 67
67 + 70 = 137

137 is 3 digit so
137 + 700 = 837

Again 837 is 3 digit so
837 + 700 = 1537

Similarly 15537 is 5 digit so add 70000
15537 + 70000 = 85537