What comes after 70 in the series 6, 13, 26, 45, 70, ..

6, 13, 26, 45, 70, ..
a(n) = 3n^2 - 2n + 5
a(6)
= 108 - 12 + 5
= 101

6,,,,,,,,13,,,,,,,26,,,,,,,,45,,,,,,,70,… ------> (1)
,,,,,7,,,,,,,,,13,,,,,,,19,,,,,,,,25,,,… -------> (2)
,,,,,,,,,,6,,,,,,,,,,6,,,,,,,,,6,,,,,,,… -------> (3)

difference in the terms in (1) is (2)

difference in the terms in (2) is 6

so adding 6 to 25 = 25+6 = 31

adding 31 to 70 = 70+31 = 101

Ans is 101

101.

6+7+6*0=13
13+7+6*1=26
26+7+6*2=45
45+7+6*3=70
70+7+6*4=101