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Search: id:A140111
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| A140111 |
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Primes of the form prime(x) + prime(x+1) - (prime(x+1) - prime(x))/2. |
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+0
1
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| 7, 11, 23, 59, 83, 97, 109, 149, 233, 283, 317, 337, 349, 359, 367, 383, 479, 487, 563, 571, 593, 641, 709, 769, 823, 839, 863
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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3+5-(5-3)/2=3+5-1=7, 5+7-(7-5)/2=5+7-1=11, ...
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MATHEMATICA
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a = {}; Do[p1 = Prime[n]; p2 = Prime[n + 1]; p = p1 + p2 - (p2 - p1)/2; If[PrimeQ[p], AppendTo[a, p]], {n, 10^2}]; a
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CROSSREFS
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Cf. A092217.
Sequence in context: A107133 A079138 A111671 this_sequence A118072 A076855 A027830
Adjacent sequences: A140108 A140109 A140110 this_sequence A140112 A140113 A140114
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 21 2008
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