Question

1 ,3 , 26 , 649 , ?​

Answer 1

Given : 1   3    26    649     ?

To find : Next number in Sequence

31790

31800

31801

31812

Solution:

1   3    26    649     ?

1

1  x 2² -  1 = 3

3 x  3² - 1  = 26

26 x 5² = 1  = 649

649 x 7² - 1 = 31800

Sequence here is previous number multiplied by square of prime number and 1 is subtracted  

Next number in series is 31800

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