A084598 & A084599, factorization

[N. J. A. Sloane]

well, the keyword "hard" is officially supposed to
indicate that kind of sequence - a sequence which 
is very hard to extend beyond the given terms

on the other hand, if you wanted to send me an entry for the index
i would be happy to include it

sequences whose extension requires factorization of 
large numbers: .........

but the trouble is there are rather a lot of such sequences!

Neil