37,
increment by n+1, with every step, starting with 10,
first answer number i 4
then 14 = 4+10
then 25 = 14 + 11
then 37 = 25 + 12
then 50 = 37 + 13
then 64 = 50 + 14
then 79 = 64 + 15
and so on
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