1^2+1=2, 2^2+1=5, 5^2+1=26... so to find the next number, square 25 and then add 1.
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That's the Fibonacci sequence! XD They're 21 and 34 if you add up the last two numbers to get the next one.
what are the next 2 numbers in this sequence: 20 , 1 ,18 ,4 ,9 ,1
1, 1 and 2
Any ordered set of numbers (and other things) is a sequence. There need not be any discernible pattern to the sequence (Brownian motion, for example), or a pattern which is understood only by the person who defined the sequence. With the last category in mind, every ordered set of numbers is a correct sequence.
Goemetric sequence : A sequence is a goemetric sequence if an/an-1is the same non-zero number for all natural numbers greater than 1. Arithmetic sequence : A sequence {an} is an arithmetic sequence if an-an-1 is the same number for all natural numbers greater than 1.