Question 834464
The differences between consecutive terms are 7, 10, 13, 16, 19:
{{{10-3=7}}}
{{{20-10=10}}}
{{{33-20=13}}}
{{{49-33=16}}}
{{{69-49=19}}} .
Each difference is 3 more than the one before.
The next difference would be {{{19+3=22}}} ,
so the next term would be {{{68+22=highlight(90)}}} .