A139192 a(n) = (prime(n)! - 4)/4.

29, 1259, 9979199, 1556755199, 88921857023999, 30411275102207999, 6463004184721244159999, 2210440498434925488635903999999, 2055709663544480704431390719999999, 3440938272806586261578994895395225599999999, 8363131653290951777042515513360187916287999999999, 15103815765843458909338783017128499376816127999999999, 64655810377792045160741088788402994992299408097279999999999, 1068720821015006391074503438347349912422585947091703431167999999999999

Offset: 3

Author

Artur Jasinski, Apr 11 2008

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 3..87

Crossrefs

Cf. A139189, A139190, A139191, A139192, A139193, A139194, A139195, A139196, A139197, A139198.

Programs

Magma

[(Factorial(NthPrime(n))-4)/4: n in [3..20]]; // Vincenzo Librandi, Jun 02 2017

Mathematica

Table[(Prime[n]! - 4)/4, {n, 3, 20}]

PARI

a(n) = (prime(n)!-4)/4;
lista(nn) = for (n=3, nn, print1(a(n), ", ")); \\ Michel Marcus, Feb 17 2018

Formula

a(n) = (A139189(n+2) - 3)/4. - R. J. Mathar, May 25 2008

Extensions

More terms from R. J. Mathar, May 25 2008