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A172048 a(n) = A104275(n) + A014076(n). 1
2, 14, 23, 32, 38, 41, 50, 53, 59, 68, 74, 77, 83, 86, 95, 98, 104, 113, 116, 122, 128, 131, 137, 140, 143, 149, 158, 167, 173, 176, 179, 182, 185, 188, 194, 200, 203, 212, 215, 218, 221, 230, 233, 239, 242, 248, 254, 257, 263, 266, 275, 278, 281, 284, 293 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Alternatively: the sequence of the numbers 3*k-1 for all nonprime 2*k-1, k >= 1.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

MATHEMATICA

Flatten[Table[If[PrimeQ[2*n - 1], {}, 3*n - 1], {n, 1, 100}]]

CROSSREFS

Cf. A104275, A014076.

Sequence in context: A116639 A220274 A036433 * A226334 A109255 A285990

Adjacent sequences:  A172045 A172046 A172047 * A172049 A172050 A172051

KEYWORD

nonn,easy,less

AUTHOR

Roger L. Bagula, Jan 24 2010

EXTENSIONS

The two equivalent definitions separated by the Assoc. Editors of the OEIS, Feb 02 2010

STATUS

approved

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Last modified June 15 16:13 EDT 2019. Contains 324142 sequences. (Running on oeis4.)