2
Add 1 to the number and then take the square root.
3968 + 1 = 3969 : √3969 = 63
63 + 1 = 64 : √64 = 8
8 + 1 = 9 : √9 = 3
3 + 1 = 4 : √4 = 2.
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2
2 because sqrt(n+1) is the series.
3968. The formula is the starting number squared, minus 1 (2*2-1=3...3*3-1=8....8*8-1=63..... 63*63-1=3968)
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