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A084468
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Odd numbers with exactly 3 ones in binary expansion.
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5
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7, 11, 13, 19, 21, 25, 35, 37, 41, 49, 67, 69, 73, 81, 97, 131, 133, 137, 145, 161, 193, 259, 261, 265, 273, 289, 321, 385, 515, 517, 521, 529, 545, 577, 641, 769, 1027, 1029, 1033, 1041, 1057, 1089, 1153, 1281, 1537, 2051, 2053, 2057, 2065, 2081, 2113, 2177
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n) = 2*A018900(n) + 1 = A005408(A018900(n)).
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MATHEMATICA
| Flatten[Table[2^m + 2^n + 1, {m, 2, 11}, {n, m - 1}]] (* From Alonso del Arte, Jul 08 2011 *)
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PROG
| (PARI) for(m=2, 9, for(n=1, m-1, print1(2^m+2^n+1", "))) \\ Charles R Greathouse IV, Oct 04 2011
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CROSSREFS
| Intersection of A005408 and A014311. A084470(n) gives the position of a(n) in A084467(n).
Sequence in context: A064149 A046289 A092246 * A152469 A115558 A067466
Adjacent sequences: A084465 A084466 A084467 * A084469 A084470 A084471
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KEYWORD
| nonn,easy
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AUTHOR
| Antti Karttunen (my_firstname.my_surname(AT)iki.fi) Jun 02 2003
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