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A023579
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Exponent of 2 in prime factorization of prime(n)+3.
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1
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0, 1, 3, 1, 1, 4, 2, 1, 1, 5, 1, 3, 2, 1, 1, 3, 1, 6, 1, 1, 2, 1, 1, 2, 2, 3, 1, 1, 4, 2, 1, 1, 2, 1, 3, 1, 5, 1, 1, 4, 1, 3, 1, 2, 3, 1, 1, 1, 1, 3, 2, 1, 2, 1, 2, 1, 4, 1, 3, 2, 1, 3, 1, 1, 2, 6, 1, 2, 1, 5, 2, 1, 1, 3, 1, 1, 3, 4, 2, 2, 1, 3, 1, 2, 1, 1, 2, 2, 4, 1, 1, 1, 1, 1, 1, 1, 9, 2, 1
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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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EXAMPLE
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For n=1, prime(1)+3=5, and 5 is odd, so a(1)=0.
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MATHEMATICA
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Table[IntegerExponent[3 + Prime[n], 2], {n, 100}] (* G. C. Greubel, May 21 2019 *)
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PROG
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(PARI) a(n) = valuation(prime(n)+3, 2); \\ Michel Marcus, Sep 30 2013
(Magma) [Valuation(3+NthPrime(n), 2): n in [1..100]]; // G. C. Greubel, May 21 2019
(Sage) [(nth_prime(n)+3).valuation(2) for n in (1..100)] # G. C. Greubel, May 21 2019
(Python)
from sympy import prime
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CROSSREFS
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KEYWORD
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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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