The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A289821 Primes of the form k!3-729, where k!3 is the triple factorial number (A007661). 1
151, 2504901671, 664565853951271, 3091650738175271, 26582634158079271, 126757680265215271, 142299187144047333874073599271, 546216992715109618958387336810111087297326406997164406744285183999999999271 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Henri & Renaud Lifchitz, PRP Records.Search for n!3-729.
OpenPFGW Project, Primality Tester
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 3] - 729, {i, 11, 100}], PrimeQ[#]&]
CROSSREFS
Cf. A247466.
Sequence in context: A206362 A200934 A174759 * A234348 A185394 A097640
KEYWORD
nonn
AUTHOR
Robert Price, Jul 12 2017
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 June 14 01:54 EDT 2024. Contains 373391 sequences. (Running on oeis4.)