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A105585 1, p and 3p, where p runs through all primes except 2 and 5. 3
1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 29, 31, 33, 37, 39, 41, 43, 47, 51, 53, 57, 59, 61, 67, 69, 71, 73, 79, 83, 87, 89, 93, 97, 101, 103, 107, 109, 111, 113, 123, 127, 129, 131, 137, 139, 141, 149, 151, 157, 159, 163, 167, 173, 177, 179, 181, 183, 191, 193, 197, 199, 201, 211 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

MAPLE

v1:=[1, 3, seq(ithprime(i), i=4..100)]; v2:=3*v1; v3:=[op(v1), op(v2)]; v4:=convert(v3, set); convert(%, list); sort(%);

MATHEMATICA

Module[{nn=50}, Select[Sort[Flatten[Join[{1, 3, 9}, Table[{n, 3n}, {n, Prime[ Range[ 4, nn]]}]]]], #<=Prime[nn]&]] (* Harvey P. Dale, Jun 16 2019 *)

CROSSREFS

Sequence in context: A085820 A045572 A069254 * A080903 A172253 A104381

Adjacent sequences:  A105582 A105583 A105584 * A105586 A105587 A105588

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 03 2008

STATUS

approved

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Last modified August 20 22:45 EDT 2019. Contains 326155 sequences. (Running on oeis4.)