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A248005
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Number of primes obtained in the first step of the long division of prime(n) by prime(i), i=2,...,n-1 (see example).
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1
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1, 1, 1, 2, 3, 2, 3, 3, 3, 5, 4, 4, 5, 4, 5, 4, 4, 5, 7, 7, 4, 7, 7, 5, 6, 6, 7, 9, 7, 8, 9, 7, 8, 8, 9, 10, 5, 7, 8, 11, 9, 13, 10, 10, 7, 9, 8, 12, 11, 12, 10, 12, 12, 12, 10, 10, 14, 12, 11, 12, 13, 10, 12, 10, 13, 15, 13, 11, 12, 12, 15, 17, 12, 13, 13, 16
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OFFSET
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3,4
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LINKS
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EXAMPLE
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Let n=16, prime(16)=53. Consider the first step of the long division of 53 by 3:
53
-3
23
Since 23 is prime, then 3 contributes 1 into a(16); also in the first step of the long division of 53 by 5,17,23 (and only by them) we obtain primes (3,2,7). So a(16)=4.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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