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Search: id:A060339
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| A060339 |
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Primes the sum of two, three, and four consecutive composite numbers. |
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+0
1
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| 311, 337, 1009, 1103, 1511, 1777, 3671, 3889, 4271, 4657, 5737, 6841, 7561, 9649, 9769, 10223, 12239, 12889, 14759, 14831, 17401, 17569, 17783, 19009, 19031, 20903, 21529, 22369, 22751, 23279, 24049, 24889, 25057, 26423, 28871, 30671
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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A(2)= 377 is equal to 168+169 = 111+112+114 = 82+84+85+86.
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MATHEMATICA
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composite[ n_Integer ] := (k = n + PrimePi[ n ] + 1; While[ k - PrimePi[ k ] - 1 != n, k++ ]; k); a = b = c = {}; Do[ p = Sum[ composite[ n + m ], {m, 0, 1} ]; If[ PrimeQ[ p ], a = Append[ a, p ] ]; p = Sum[ composite[ n + m ], {m, 0, 2} ]; If[ PrimeQ[ p ], b = Append[ b, p ] ]; p = Sum[ composite[ n + m ], {m, 0, 3} ]; If[ PrimeQ[ p ], c = Append[ c, p ] ], {n, 1, 25000} ]; Intersection[ a, b, c ]
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CROSSREFS
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Sequence in context: A115438 A134549 A084876 this_sequence A046016 A059225 A113155
Adjacent sequences: A060336 A060337 A060338 this_sequence A060340 A060341 A060342
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 30 2001
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