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A046388
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Odd numbers with exactly 2 distinct prime factors.
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8
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15, 21, 33, 35, 39, 45, 51, 55, 57, 63, 65, 69, 75, 77, 85, 87, 91, 93, 95, 99, 111, 115, 117, 119, 123, 129, 133, 135, 141, 143, 145, 147, 153, 155, 159, 161, 171, 175, 177, 183, 185, 187, 189, 201, 203, 205, 207, 209, 213, 215, 217, 219, 221, 225, 235, 237
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Subset of A098905 (which contains in addition A046390 and numbers like 255255, 285285, 345345, 373065 etc.). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 13 2008]
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MAPLE
| isA046388 := proc(n) RETURN( (n mod 2 = 1) and (A001221(n) = 2) ); end proc:
for n from 1 to 840 do if isA046388(n) then printf("%d, ", n) ; end if; end do: [From R. J. Mathar, Oct 13 2008]
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PROG
| (PARI) is_A046388(n)={ bittest(n, 0) & omega(n)==2 } \\ - M. F. Hasler, Feb 13 2012
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CROSSREFS
| Cf. A046315, A046404, A024556, A056913.
Sequence in context: A070005 A061346 * A098905 A024556 A146166 A056913
Adjacent sequences: A046385 A046386 A046387 * A046389 A046390 A046391
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KEYWORD
| nonn,changed
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 15 1998.
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EXTENSIONS
| Inserted 45, 63, 75, 99, 117, 135 etc. by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 13 2008
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