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A065313
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a(n) = Pi(n*Pi(n)).
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2
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0, 1, 3, 4, 6, 7, 9, 11, 11, 12, 16, 17, 21, 23, 24, 24, 30, 30, 36, 37, 39, 40, 46, 47, 48, 51, 53, 54, 61, 62, 68, 70, 72, 74, 76, 77, 86, 87, 91, 92, 99, 100, 110, 112, 114, 117, 126, 128, 130, 132, 135, 137, 146, 150, 151, 154, 156, 157, 168, 171, 184, 186, 189
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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MATHEMATICA
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Table[PrimePi[w*PrimePi[w]], {w, 1, 100}].
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PROG
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(PARI) { for (n=1, 1000, if (n>1, a=primepi(n*primepi(n)), a=0); write("b065313.txt", n, " ", a) ) } \\ Harry J. Smith, Oct 16 2009
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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