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A139638 Least number k such that k*p(n)*(k*p(n)+1)-1, k*p(n)*(k*p(n)+1)+1, k*p(n)*(k*p(n)+3)-1 and k*p(n)*(k*p(n)+3)+1 are all primes, two pairs of twin primes, with p(i) = i-th prime. 0
312, 1, 3, 195, 45, 48, 4884, 732, 3525, 570, 1230, 2244, 930, 15555, 660, 6513, 4656, 228, 2847, 180, 2613, 21, 18, 1176, 2832, 63, 3168, 4500, 12, 4740, 225, 465, 4602, 5940, 25575, 38799, 6939, 4821, 2067, 81, 21090, 9570, 18480, 558, 15762, 34836 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

1*3*(1*3+1)-1=11, 11 and 13 twin primes

1*3*(1*3+3)-1=17, 17 and 19 twin primes so k(2)=1 as p(2)=3

CROSSREFS

Sequence in context: A061329 A082862 A071644 * A112542 A011774 A011251

Adjacent sequences:  A139635 A139636 A139637 * A139639 A139640 A139641

KEYWORD

nonn

AUTHOR

Pierre CAMI (pierre-cami(AT)bbox.fr), Apr 28 2008

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Last modified February 14 17:10 EST 2012. Contains 205644 sequences.