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Search: id:A131021
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| A131021 |
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Prime semiperimeters of quadrilaterals with sides which are four consecutive primes. |
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+0
2
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| 13, 101, 739, 751, 1301, 1459, 1471, 1483, 1583, 1619, 1877, 1889, 1949, 2213, 2239, 2351, 2381, 2441, 2473, 2549, 2741, 2917, 3271, 3413, 3863, 4133, 4567, 4987, 5081, 5279, 5347, 5783, 5813, 6719, 7027, 7369, 7459, 7607, 8233, 8291, 9151, 9187, 9397
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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These are the prime numbers in A131019(k), ocurring at k=1, 13, 71, 72, 116, 127, 128, 129, 136, 138, 157, 158, 162, 183, 185, ....
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FORMULA
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A131019 INTERSECT A000040.
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MAPLE
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for n from 1 to 1000 do a131019 := add(ithprime(n+i), i=1..4)/2 : if isprime(a131019) then printf("%d, ", a131019) ; fi ; od:
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CROSSREFS
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Sequence in context: A075604 A083341 A142297 this_sequence A087595 A117653 A004635
Adjacent sequences: A131018 A131019 A131020 this_sequence A131022 A131023 A131024
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KEYWORD
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easy,nonn,less
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AUTHOR
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R. J. Mathar and Jonathan Vos Post (mathar(AT)strw.leidenuniv.nl), Jun 12 2007
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