Question

How we have got these numbers like 1,7,19,37,61,91,127,169.......

Answer 1

These are odd no.s which r not divisible by 3 and6

Answer 2

In each the difference is a multiple of 6. First the difference between 1 and 7 is 6 then between 7 and 19 is 12 after on it is like 18,24,30..... so by adding multiples of 6 in each case we got these numbers