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A084468 Odd numbers with exactly 3 ones in binary expansion. 7
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; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

FORMULA

a(n) = 2*A018900(n) + 1 = A005408(A018900(n)).

MATHEMATICA

Flatten[Table[2^m + 2^n + 1, {m, 2, 11}, {n, m - 1}]] (* Alonso del Arte, Jul 08 2011 *)

PROG

(PARI) for(m=2, 9, for(n=1, m-1, print1(2^m+2^n+1", "))) \\ Charles R Greathouse IV, Oct 04 2011

CROSSREFS

Intersection of A005408 and A014311. A084470(n) gives the position of a(n) in A084467(n).

Sequence in context: A064149 A046289 A092246 * A292315 A274915 A336381

Adjacent sequences:  A084465 A084466 A084467 * A084469 A084470 A084471

KEYWORD

nonn,easy

AUTHOR

Antti Karttunen, Jun 02 2003

STATUS

approved

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Last modified July 27 02:39 EDT 2021. Contains 346302 sequences. (Running on oeis4.)