A288608 Primes of the form k!6+3, where k!6 is the sextuple factorial number (A085158).

5, 7, 19, 43, 227, 643, 4483, 14083, 116483, 13404163, 333247405883392003, 75494329921353417731638961852391076220895232000003, 607641057683281452422878601758017247375890833361248739064460794062744301780319012095222746705407815771488256000000000000003

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..14

Henri& Renaud Lifchitz, PRP Records.Search for n!6+3.

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 6] + 3, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A287844.

Sequence in context: A321510 A084198 A036061 * A079361 A162268 A045447

Adjacent sequences: A288605 A288606 A288607 * A288609 A288610 A288611

Keyword

nonn

Author

Robert Price, Jun 11 2017

Status

approved