1;4;13;40...;...;...;...;
Regula este urmatoarea:
1+3¹=4
4+3²=4+9=13
13+3³=13+27=40
40+3⁴=40+81=121
121+3⁵=121+243=364
364+3⁶=364+729=1093
1093+3⁷=1093+2187=3280
3280+3⁸=3280+6561=9841
Deci urmatorii cinci termeni dupa 1,4,13,40 sunt:121,364,1093,3280,9841
Succes !
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