Question 1158704

Find the first six partial sums {{{S1}}}, {{{S2}}}, {{{S3}}},{{{ S4}}}, {{{S5}}}, {{{S6}}} of the sequence whose nth term is given.
{{{1}}}, {{{5}}},{{{ 9}}}, {{{13}}}, . . .

as you can see, common difference is {{{4}}}
{{{d=5-1=4}}}
{{{d=9-5=4}}}

so, next term will be {{{17}}}, then comes{{{ 21}}}, {{{25}}}, and so on

{{{S1=1}}}
{{{S2=1+5=6}}} 
{{{S3=1+5+9=15}}}
{{{ S4=1+5+9+13=28}}}
{{{S5=1+5+9+13+17=45}}}
{{{S6=1+5+9+13+17+21=66}}}