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A143427
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a(n)=least prime == -1 mod 6 such that q(n)*(q(n)+a(n))-1 is prime with q(i)=i-th prime == 1 mod 6.
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4
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5, 5, 11, 11, 5, 5, 11, 23, 5, 11, 17, 41, 23, 5, 11, 17, 29, 17, 17, 11, 47, 41, 11, 11, 41, 11, 29, 41, 5, 11, 29, 17, 11, 5, 47, 17, 17, 53, 11, 5, 17, 17, 47, 29, 11, 23, 11, 5, 17, 5, 17, 29, 11, 17, 29, 11, 17, 5, 11, 17, 5, 17, 17, 29, 17, 17, 5, 23, 23, 11, 113, 17, 113, 5
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Pierre CAMI, Table of n, a(n) for n = 1..10000
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EXAMPLE
| q(1)=7, 7*(7+5)-1=83 prime, 5 prime == -1 mod 6 so a(1)=5
q(2)=13, 13*(13+5)-1=233 prime, so a(2)=5
q(3)=19, 19*(19+5)-1=455 composite 19*(19+11)-1=569 prime, 11 prime == -1 mod 6 so a(3)=11
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CROSSREFS
| Cf. A143428, A143429, A143430.
Sequence in context: A130889 A184827 A058610 * A168300 A101203 A141244
Adjacent sequences: A143424 A143425 A143426 * A143428 A143429 A143430
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KEYWORD
| nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Aug 14 2008
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