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A109934
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Composite numbers which are not the sum of two distinct primes.
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4
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4, 6, 27, 35, 51, 57, 65, 77, 87, 93, 95, 117, 119, 121, 123, 125, 135, 143, 145, 147, 155, 161, 171, 177, 185, 187, 189, 203, 205, 207, 209, 215, 217, 219, 221, 237, 245, 247, 249, 255, 261, 267, 275, 287, 289, 291, 297, 299, 301, 303, 305, 321, 323, 325, 327
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Perhaps there are no even terms > 6.
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LINKS
| T. D. Noe, Table of n, a(n) for n = 1..10000
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MATHEMATICA
| f[n_] := (p = 0; pn = PrimePi[n];
Do[ If[n == Prime[i] + Prime[k], p = p + 1; If[p > 2, Break[]]], {i, 1, pn},
{k, i+1, pn}]; p );
Select[Range[2, 400], ! PrimeQ[#] && f[#] == 0 & ] (* Jean-François Alcover, Mar 07 2011 *)
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CROSSREFS
| Cf. A025583.
Sequence in context: A074120 A054265 A105409 * A068321 A012896 A013078
Adjacent sequences: A109931 A109932 A109933 * A109935 A109936 A109937
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 19 2005
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