A166007 Number of ones in the binary representation of the middle member q of the prime triple (p,q,r) with p<q<r=p+6.

3, 3, 3, 2, 3, 3, 4, 4, 4, 5, 5, 5, 3, 4, 5, 5, 4, 6, 5, 6, 6, 7, 5, 4, 7, 7, 6, 7, 6, 7, 4, 4, 9, 5, 6, 6, 6, 7, 7, 8, 6, 5, 5, 5, 9, 8, 6, 7, 8, 9, 4, 5, 6, 8, 7, 6, 6, 9, 4, 7, 7, 8, 7, 7, 6, 7, 7, 7, 7, 7, 9, 8, 3, 6, 6, 7, 7, 7, 7, 6, 7, 8, 6, 6, 5, 8

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

For n = 3, (p, q, r) = (11, 13, 17), q = 13
Decimal 13 = Binary 1101
a(3) = Number of ones in 1101 = 3

Mathematica

DigitCount[#, 2, 1]&/@Transpose[Select[Partition[Prime[Range[1000]], 3, 1], Last[#]-First[#]==6&]][[2]] (* Harvey P. Dale, Dec 03 2014 *)

Crossrefs

Cf. A098414, A014499

Sequence in context: A356525 A226895 A306996 * A372748 A087497 A085767

Adjacent sequences: A166004 A166005 A166006 * A166008 A166009 A166010

Keyword

base,nonn

Author

Steven Lubars (lubars(AT)gmail.com), Oct 03 2009

Extensions

More terms from Harvey P. Dale, Dec 03 2014

Status

approved