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Cf. A000040.
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Primes other than those of the form prime(prime(n)+n-1).
a(n) can be approximated by 3n3*n^2/5000 + 9.124n124*n - 285.77 . (End)
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_Amarnath Murthy _ and Jason Earls, Jul 12 2003
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Contribution from _From _Carmine Suriano_, Jan 25 2011: (Start)