11+12=23 *cele 2 numere*
1,2,3,4,5,6,7,8,9,10 numerele inaintea lor
13,14,15,16,17,18,19,20,21,22 numerele dupa ele
Multimea are 22 de numere.
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22=3+7+11+15+19+23+27+31+35+39+43=10+26+42+58+74+43=36+100+117=36+217=253 *suma lor*