OFFSET
2,1
COMMENTS
Conjecture: For n >= 2, n! - a(n) is 1 or a prime, see A033933. - Amarnath Murthy, Mar 19 2002
a(n) is the largest prime divisor of (n!)! of the sequence A000197. - Stanislav Sykora, Jul 14 2014
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Donovan Johnson, Table of n, a(n) for n = 2..400
R. G. Wilson v, Letter to N. J. A. Sloane, Oct. 1993
MATHEMATICA
PrevPrime[ n_Integer ] := Module[ {k = n - 1}, While[ ! PrimeQ[ k ], k-- ]; k ]; Table[ PrevPrime[ n! ], {n, 3, 25} ]
Join[{2}, NextPrime[Range[3, 30]!, -1]] (* Harvey P. Dale, Jan 24 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Jud McCranie; also from Robert G. Wilson v, Jan 03 2001
STATUS
approved