This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A263029 Numbers n such that A002322(n) + 1 is not a prime, where A002322 is Carmichael lambda. 5
 25, 32, 50, 55, 75, 81, 96, 100, 110, 115, 119, 121, 128, 150, 153, 160, 162, 165, 176, 187, 200, 203, 209, 215, 220, 221, 224, 230, 235, 238, 242, 245, 253, 256, 261, 275, 287, 288, 289, 295, 297, 299, 300, 306, 319, 323, 324, 330, 335, 343, 345, 355 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Complement of A263028. LINKS Antti Karttunen, Table of n, a(n) for n = 1..25794 MATHEMATICA Select[Range[1, 400], ! PrimeQ[CarmichaelLambda[#] + 1] &] PROG (MAGMA) [n: n in [2..400] | not IsPrime(CarmichaelLambda(n)+1)]; (PARI) for(n=1, 1e3, if(isprime((1 + lcm(znstar(n)[2]))) == 0, print1(n", "))) \\ Altug Alkan, Oct 12 2015 CROSSREFS Cf. A002322, A263027, A263028. Positions of zeros in A296077. Cf. also A039689. Sequence in context: A172007 A107258 A258876 * A225418 A035140 A050694 Adjacent sequences:  A263026 A263027 A263028 * A263030 A263031 A263032 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Oct 12 2015 STATUS approved

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

Last modified August 18 04:50 EDT 2019. Contains 326072 sequences. (Running on oeis4.)