1 + 8 + 64 + 125 = 198. Did you mean to miss out 27?
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The first 5 cubed numbers are 1x1x1=1, 2x2x2=8, 3x3x3=27, 4x4x4=64 and 5x5x5=125. :)
28 is the non-cubic number The others work out like this - 2x2x2=8 4x4x4=64 5x5x5=125
1x1x1=1 2x2x2=8 3x3x3=27 4x4x4=64 5x5x5=125 6x6x6=216 7x7x7=343 8x8x8=512 9x9x9=729 10x10x10=1000 11x11x11=1331 12x12x12=1728 13x13x13=2197 14x14x14=2744 15x15x15=3375 16x16x16=4096 17x17x17=4913 18x18x18=5832 19x19x19=6859 20x20x20=8000 21x21x21=9261 use calculator to work out the rest cant be bothered to write out any more LOL :-)
5x5x5 5x5x5 5x5x5 5x5x5
5x5x5 equals 125 so that 3 fives used 125-5 equals 120 that's 4 used then 120/5 equals 24 that's 5 Done Easy as that Here's the equation ((5x5x5)-5)/5