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Search: id:A001172
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| A001172 |
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Smallest even number which is an unordered sum of two odd primes in exactly n ways.
(Formerly M4085 N1694)
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+0
11
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| 2, 6, 10, 22, 34, 48, 60, 78, 84, 90, 114, 144, 120, 168, 180, 234, 246, 288, 240, 210, 324, 300, 360, 474, 330, 528, 576, 390, 462, 480, 420, 570, 510, 672, 792, 756, 876, 714, 798, 690, 1038, 630, 1008, 930, 780, 960, 870, 924, 900, 1134, 1434, 840, 990, 1302
(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)=A023036(n) for all n > 1.
Except for initial term, the same as A023036.
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..10000
Index entries for sequences related to Goldbach conjecture
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MATHEMATICA
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a = Table[0, {55}]; Do[c = 0; k = 3; While[k <= n/2, If[PrimeQ[k] && PrimeQ[n - k], c++ ]; k++ ]; If[c < 56 && a[[c]] == 0, a[[c]] = n], {n, 6, 1310, 2}]
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CROSSREFS
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Cf. A000954, A000974, A002375
Sequence in context: A080715 A034168 A055745 this_sequence A167512 A055895 A125527
Adjacent sequences: A001169 A001170 A001171 this_sequence A001173 A001174 A001175
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Eric Wolman
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