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A093502
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a(1) = 2; for n > 0, a(n+1) is the a(n)-th prime after a(n).
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1
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2, 5, 19, 103, 733, 6691, 76831, 1081429, 18242699, 361919671, 8309068723, 217809953467, 6445388418589, 213232943658197, 7821073506524401, 315743571062703689
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OFFSET
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1,1
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LINKS
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FORMULA
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a(1)=2, a(n) = next a(n-1)th prime after a(n-1). - Zak Seidov, Mar 21 2009
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EXAMPLE
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19 follows 5 as there are 5 primes > 5 and up to 19 inclusive, (7,11,13,17,19).
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MATHEMATICA
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a[1] := 2; a[n_] := Prime[PrimePi[a[n - 1]] + a[n - 1]]; Table[a[n], {n, 1, 10}] (* Stefan Steinerberger, Apr 10 2006 *)
NestList[Prime[PrimePi[ # ] + # ] &, 2, 13] (* Zak Seidov, Mar 21 2009 *)
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PROG
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(Python)
from sympy import prime
p, q = 2, 1
for _ in range(15):
r = p + q
p, q = prime(r), r
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CROSSREFS
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KEYWORD
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more,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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