0,1

C(2k,k) == 1 (mod 9) for k=0,274,280,334,760,766,814,822,838,840,982,1000,1002,....and all computed values of k < 5000 are even. Hence 9 is considered to be in the sequence.

Sequence in context: A084593 A102968 A089593 this_sequence A018533 A076052 A050556

Adjacent sequences: A086745 A086746 A086747 this_sequence A086749 A086750 A086751

nonn

Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 30 2003