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Search: id:A126204
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| A126204 |
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Least prime representable as the arithmetic mean of two other primes in n different ways. |
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+0
3
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| 2, 5, 11, 17, 37, 53, 89, 71, 101, 179, 137, 193, 233, 257, 251, 401, 311, 373, 347, 457, 661, 479, 547, 599, 617, 641, 683, 907, 881, 773, 827, 809, 941, 1033, 977, 1289, 1201, 1187, 1229, 1223, 1277, 1361, 1597, 1493, 1447, 1499, 1451, 1549, 1487, 1709, 1933
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(n)=A000040(A137700(n)); A071681(A137700(n))=n and A071681(m)<>n for m<A137700(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 07 2008
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LINKS
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Robert G. Wilson, v, Table of n, a(n) for n=0..11300.
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MATHEMATICA
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f[n_] := Block[{c = 0, k = PrimePi@n - 1}, While[k > 0, If[ PrimeQ[2n - Prime@k], c++ ]; k-- ]; c]; t = Table[0, {1000}]; Do[ p = Prime@n; a = f@p; If[a < 1001 && t[[a]] == 0, t[[a]] = p; Print[{a, p}]], {n, 8900}]
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CROSSREFS
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Cf. A071681.
Sequence in context: A059987 A027426 A133928 this_sequence A091936 A153145 A144572
Adjacent sequences: A126201 A126202 A126203 this_sequence A126205 A126206 A126207
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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 22 2007
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EXTENSIONS
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Start of b-file modified to match sequence by N. J. A. Sloane, Aug 31 2009
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