OFFSET
1,1
COMMENTS
Next term > 10^5. - Joerg Arndt, Oct 17 2016
From Serge Batalov, Feb 02 2022: (Start)
Next term (if it exists) > 2*10^7.
This sequence may be finite, for the reason that with increasing n, the density of trivially composite Motzkin numbers approaches 1. For 7*10^6 < n < 20*10^6, all Motzkin numbers have a small factor not exceeding 63809. See below.
LINKS
Rob Burns, Structure and asymptotics for Motzkin numbers modulo small primes using automata, arXiv:1612.08146 [math.NT], 2016.
E. Rowland and R. Yassawi, Automatic congruences for diagonals of rational functions, arXiv preprint arXiv:1310.8635 [math.NT], 2013-2014.
Eric Weisstein's World of Mathematics, Motzkin Number
Eric Weisstein's World of Mathematics, Integer Sequence Primes
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Mar 06 2004
STATUS
approved