Question 976590
{{{O<20}}}
{{{S[1]=1+3+5+7+9+11+13+15+17+19}}}
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{{{O<30}}}
{{{S[2]=S[1]+21+23+25+27+29}}}
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{{{O<40}}}
{{{S[3]=S[2]+31+33+35+37+39}}}
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{{{O<55}}}
{{{S[4]=S[3]+41+43+45+47+49+51+53}}}