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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089131 Primes of the form (k! + 3)/3. 2
3, 41, 241, 13441, 13305601, 118562476032001, 8617338912961658880001, 123997775596633739155999816050278400000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term is too large to include.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..13

MATHEMATICA

Select[Table[(n!+3)/3, {n, 0, 50}], PrimeQ] (* Vincenzo Librandi, Dec 12 2011 *)

PROG

(PARI) nfactp2d2(n) = { for(x=1, n, y=floor((x!+ 3)/3); if(isprime(y), print1(y", ")) ) }

(MAGMA) [a: n in [1..50] | IsPrime(a) where a is (Factorial(n)+3) div 3]; // Vincenzo Librandi, Dec 12 2011

CROSSREFS

Cf. A089085.

Sequence in context: A343814 A106978 A260832 * A057650 A280176 A322244

Adjacent sequences:  A089128 A089129 A089130 * A089132 A089133 A089134

KEYWORD

nonn

AUTHOR

Cino Hilliard, Dec 05 2003

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 13 14:01 EDT 2022. Contains 356091 sequences. (Running on oeis4.)