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A126660
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Array read by antidiagonals: A(k,n) = smallest odd prime q such that pq+2k is prime, where p is the n-th odd prime, or 0 if no such prime exists.
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2
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3, 3, 3, 0, 3, 3, 3, 5, 7, 7, 3, 3, 5, 3, 3, 0, 0, 3, 5, 3, 3, 3, 5, 3, 3, 5, 5, 3, 5, 3, 5, 3, 3, 11, 3, 3, 0, 3, 0, 5, 7, 3, 5, 3, 3, 3, 5, 3, 3, 7, 3, 5, 7, 5, 5, 3, 0, 5, 5, 3, 5, 3, 13, 5, 3, 3, 0, 3, 3, 5, 7, 19, 5, 3, 7, 7, 7, 61, 5, 7, 3, 3, 5, 3, 3, 5, 3, 3, 5, 3, 3, 3, 3, 5, 0, 3, 5, 3, 3, 5, 3, 5, 5, 13
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| Row 1 of the array is A126608 = smallest odd prime q such that pq+2 is prime, where p is the n-th odd prime.
Array with rows k and columns n starts
k\p..3...5...7..11..13..17..19..23..29..31..37..41..43..47.
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.1|..3...3...3...7...3...3...3...3...3...5...3..61...3...7.
.2|..3...3...7...3...3...5...3...3...5...3...7...3..13...5.
.3|..0...5...5...5...5..11...5...7...5...7...5...5...7...5.
.4|..3...3...3...3...3...3...5..13...7...3...5...3...3...3.
.5|..3...0...3...3...7...3...3...3...3...3...7..11...3...3.
.6|..0...5...5...5...7...5...5...5...5...5...5..11...5..17.
.7|..3...3...0...3...3..19...3...3...3...3...5...3...5..19.
.8|..5...3...3...5...7...3...3...5...3...3...3...3...7...3.
.9|..0...5...5...5...5...5...5...7...5...5...7...5...5...7.
10|..3...0...3...3...3...3..11...3...3...3...3...7...3...7.
11|..3...3...3...0...3...3...3...5...3...7...7...5...3...3.
12|..0...7...5...5...5...5...7...5...7...5...7...5...5...7.
13|..5...3...3...3...0..19...3..19...3...5...3...3...5...3.
14|..3...3...0...3...3...3..19...3...5..13...3...3...3...5.
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CROSSREFS
| Cf. A000040, A126608-A126609, A126661.
Sequence in context: A002073 A130719 A143606 * A202698 A164884 A019801
Adjacent sequences: A126657 A126658 A126659 * A126661 A126662 A126663
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Feb 09 2007
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EXTENSIONS
| Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 13 2007
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