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A046953 6n-1 is composite. 9
6, 11, 13, 16, 20, 21, 24, 26, 27, 31, 34, 35, 36, 37, 41, 46, 48, 50, 51, 54, 55, 56, 57, 61, 62, 63, 66, 68, 69, 71, 73, 76, 79, 81, 83, 86, 88, 89, 90, 91, 92, 96, 97, 101, 102, 104, 105, 106, 111, 112, 115, 116, 118, 119, 121, 122, 123, 125, 126, 128 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(1)=6 because 6*6-1=35 that is composite

MATHEMATICA

Select[Range[200], !PrimeQ[6#-1]&] (*From Vladimir Joseph Stephan Orlovsky, Feb 25 2011*)

CROSSREFS

Sequence in context: A015870 A004471 A175021 * A121765 A102974 A154293

Adjacent sequences:  A046950 A046951 A046952 * A046954 A046955 A046956

KEYWORD

nonn

AUTHOR

Felice Russo (frusso(AT)micron.com)

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Last modified February 16 16:00 EST 2012. Contains 205938 sequences.