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A071182 SPF(n+1)-SPF(n), where SPF(n) denotes the smallest prime factor of n. +0
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1, -1, 3, -3, 5, -5, 1, -1, 9, -9, 11, -11, 1, -1, 15, -15, 17, -17, 1, -1, 21, -21, 3, -3, 1, -1, 27, -27, 29, -29, 1, -1, 3, -3, 35, -35, 1, -1, 39, -39, 41, -41, 1, -1, 45, -45, 5, -5, 1, -1, 51, -51, 3, -3, 1, -1, 57, -57, 59, -59, 1, -1, 3, -3, 65, -65, 1, -1, 69, -69, 71, -71, 1, -1, 5, -5, 77, -77, 1, -1, 81, -81, 3, -3, 1 (list; graph; listen)
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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.


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