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A089615
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Number of primes between n^2 and (n+1/5)^2.
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0
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0, 0, 0, 1, 0, 1, 0, 1, 1, 2, 0, 0, 1, 2, 2, 1, 1, 1, 1, 1, 2, 2, 0, 1, 1, 2, 2, 1, 0, 2, 2, 2, 3, 1, 3, 4, 2, 4, 2, 4, 2, 1, 1, 2, 3, 2, 2, 2, 2, 1, 3, 4, 1, 2, 2, 1, 5, 2, 2, 4, 3, 4, 1, 2, 4, 3, 3, 5, 2, 3, 2, 3, 3, 5, 5, 4, 2, 4, 5, 2, 5, 2, 4, 3, 5, 2, 6, 3, 5, 4, 6, 1, 4, 6, 5, 4, 7, 6, 6, 4, 2, 3, 4, 4, 4
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OFFSET
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1,10
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LINKS
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Table of n, a(n) for n=1..105.
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MATHEMATICA
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Table[PrimePi[(n+1/5)^2]-PrimePi[n^2], {n, 110}] (* From Harvey P. Dale, Nov 10 2011 *)
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PROG
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(PARI) pbetweensq2(n) = { for(x=1, n, c=0; for(y=floor(x)^2, (x+1/5)^2, if(isprime(y), c++) ); print1(c", ") ) }
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CROSSREFS
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Sequence in context: A112020 A069160 A089616 * A089731 A097098 A123679
Adjacent sequences: A089612 A089613 A089614 * A089616 A089617 A089618
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Dec 30 2003
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STATUS
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approved
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