The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A253106 Semiprimes with smallest factor <= 3. 3
 4, 6, 9, 10, 14, 15, 21, 22, 26, 33, 34, 38, 39, 46, 51, 57, 58, 62, 69, 74, 82, 86, 87, 93, 94, 106, 111, 118, 122, 123, 129, 134, 141, 142, 146, 158, 159, 166, 177, 178, 183, 194, 201, 202, 206, 213, 214, 218, 219, 226, 237, 249, 254, 262, 267, 274, 278 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A253046(a(n)) != a(n). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 PROG (Haskell) a253106 n = a253106_list !! (n-1) a253106_list = filter f [1..] where f x = p <= 3 && a010051' (div x p) == 1 where p = a020639 x CROSSREFS Cf. Union of A001748 and A100484, A020639, A010051, A001358, A171156, A253046. Sequence in context: A338904 A046368 A236108 * A320969 A113433 A115654 Adjacent sequences: A253103 A253104 A253105 * A253107 A253108 A253109 KEYWORD nonn AUTHOR Reinhard Zumkeller, Dec 26 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 14 02:14 EDT 2024. Contains 375146 sequences. (Running on oeis4.)