This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A108098 Numbers a(n) such that there is no k<=2a(n) with a(n)!+k!-1 prime. 0

%I

%S 48,63,68,74,111,129,135,161,168,174,197,236,240,243,273,279,282,285,

%T 309,322,335,347,360,393,407,419,431,437,439,440,455,460,461,483,491,

%U 494,497,512,517,522,526,532,544,567,591,614,625,650,662,663,681,687

%N Numbers a(n) such that there is no k<=2a(n) with a(n)!+k!-1 prime.

%C For numbers m <= 320 that are not in the sequence, there exists an integer k <= 2m such that m! + k! - 1 is a certified prime. For m > 320 the values of m! + k! - 1 are only probable primes. - Ryan Propper (rpropper(AT)stanford.edu), Sep 02 2005

%t Do[l = Range[1, 2*n]; If[Length[Select[l, PrimeQ[n! + #! - 1]&]] == 0, Print[n]], {n, 1, 729}] (Propper)

%Y Cf. A075758.

%K nonn

%O 1,1

%A Ralf Stephan, Jun 01 2005

%E More terms from Ryan Propper (rpropper(AT)stanford.edu), Sep 02 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .