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A035345
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Smallest prime > prime(1)*prime(2)*...*prime(n)+1.
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6
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3, 5, 11, 37, 223, 2333, 30047, 510529, 9699713, 223092907, 6469693291, 200560490197, 7420738134871, 304250263527281, 13082761331670077, 614889782588491517, 32589158477190044789, 1922760350154212639131
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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Next prime after 2*3*5 + 1 = 31 is 37, so a(3)=37.
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MATHEMATICA
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Table[NextPrime[Product[Prime@ k, {k, n}] + 1], {n, 0, 17}] (* Michael De Vlieger, Dec 02 2015 *)
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PROG
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(PARI) a(n) = nextprime(2+factorback(primes(n))); \\ Michel Marcus, Dec 24 2022
(Python)
from sympy import nextprime, primorial
def a(n): return nextprime(1 + (primorial(n) if n else 1))
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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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