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A055131
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Those composite s for which A055095[s] = 2.
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1
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15, 39, 51, 87, 111, 123, 159, 183, 219, 267, 291, 303, 327, 339, 411, 447, 471, 519, 543, 579, 591, 687, 699, 723, 771, 807, 831, 843, 879, 939, 951, 1011, 1047, 1059, 1119, 1167, 1191, 1203, 1227, 1263, 1299, 1347, 1371, 1383, 1527, 1563, 1623, 1671
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n) = 3*((4*A005098[n])+1) = 3*A002144[n] ??? (Conjecture, not yet proved)
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MAPLE
| find_A055095_is_2_composites := proc(upto_n) local j, a; a := []; for j from 1 to upto_n do if(-1 = (j - wt(GrayCode(qrs2bincode((2*j)+1))))) then if(not isprime((2*j)+1)) then a := [op(a), ((2*j)+1)]; fi; fi; od; RETURN(a); end;
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CROSSREFS
| Sequence in context: A154988 A086096 A176257 * A121051 A139042 A020142
Adjacent sequences: A055128 A055129 A055130 * A055132 A055133 A055134
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KEYWORD
| nonn
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AUTHOR
| Antti Karttunen Apr 04 2000
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Apr 21 2000
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