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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A132830 Numbers of the form 3^n+2 which are not primes. 1
 245, 731, 2189, 19685, 177149, 531443, 1594325, 43046723, 129140165, 387420491, 1162261469, 3486784403, 10460353205, 31381059611, 94143178829, 847288609445, 7625597484989, 22876792454963, 68630377364885, 205891132094651 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA a = {}; c = 3^x + 2; Do[If[PrimeQ[c], 0, AppendTo[a, c]], {x, 0, 100}]; a (*Artur Jasinski*) Select[3^Range[0, 30]+2, !PrimeQ[#]&] (* Harvey P. Dale, Nov 21 2012 *) CROSSREFS Cf. A057735, A051783, A132829. Sequence in context: A137521 A257781 A188239 * A350421 A236887 A237161 Adjacent sequences:  A132827 A132828 A132829 * A132831 A132832 A132833 KEYWORD nonn AUTHOR Artur Jasinski, Sep 03 2007 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 10 16:24 EDT 2022. Contains 356039 sequences. (Running on oeis4.)