26
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1, 2, 4, 13, 26, 52.
4 goes into 52 13 times without a remainder 4 x 13 = 52
4s2 - 9 can be expressed by using the identity: a2 - b2 = (a-b)(a+b) Therefore, 4s2 - 9 = (2s)2 - 32 = (2s-3)(2s+3)
1, 2, 4, 13, 26, 52.
2, 4, 26, 52.