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A230460
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Prime(2*prime(n)).
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5
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7, 13, 29, 43, 79, 101, 139, 163, 199, 271, 293, 373, 421, 443, 491, 577, 647, 673, 757, 821, 839, 929, 983, 1061, 1181, 1231, 1277, 1307, 1361, 1429, 1609, 1667, 1759, 1789, 1973, 1997, 2083, 2161, 2243, 2339, 2411, 2441, 2633, 2663, 2707, 2729, 2917
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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a(n) ~ 2n log(n) log(2n log(n)) ~ 2n (log n)^2.
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EXAMPLE
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a(3) = 29 because the third prime is 5, and 2 * 5 = 10, and then we see that the tenth prime is 29.
a(4) = 43 because the fourth prime is 7, and 2 * 7 = 14, and then we see that the fourteenth prime is 43.
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MATHEMATICA
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PROG
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(PARI) A230460=n->prime(2*prime(n))
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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