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A089635
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Smallest member of a pair of consecutive twin prime pairs that have three primes between them.
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0
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107, 239, 311, 569, 1229, 1427, 1997, 2687, 4049, 4127, 4157, 4481, 5231, 6089, 7559, 9629, 10457, 13829, 13901, 14249, 16187, 16649, 17207, 17597, 17957, 18059, 19841, 20507, 21317, 21491, 21557, 22481, 27689, 28109, 28277, 28349, 31769, 32141
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OFFSET
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3,1
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LINKS
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Table of n, a(n) for n=3..40.
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PROG
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(PARI) pbetweentw(n, p) = \p is the number of primes between { forstep(x1=1, n, 1, c=0; t1 = twin[x1]; t2 = twin[x1+1]; for(y=t1+4, t2-1, if(isprime(y), c++) ); if(c==p, print1(t1", ")) ) } savetwins(n) = \ build a twin prime table of lower bounds { twin = vector(n); c=1; forprime(x=3, n*10, if(isprime(x+2), twin[c]=x; c++; ) )
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CROSSREFS
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Sequence in context: A141996 A142844 A142914 * A201220 A088563 A142222
Adjacent sequences: A089632 A089633 A089634 * A089636 A089637 A089638
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jan 01 2004
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STATUS
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approved
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