72, 144, 216, 288, 360, 432, 504, 576 +72 . . .
5 8/18 Work out how many 18s go into the top number, until there is a remainder, in this case 5 18s go into 98 and leaves us with 8 spare.
LCM = 168
The number 8 is the factor of 18. But 8 is not a multiple of 6.
The number of electrons in the electron shells are 2, 8, 18, 18, 8.
8 with remainder 20.
8 is a good number and 18 is to all the numbers with 8 in it is a good number or eney one with 7 is to.
18 of them with a remainder of 1
18 with 1 remaining 145 - 1 = 144 = 8 x 18
18 times - with a remainder of 6.
18. 1+8=9 9x2=18
8 times
26 Edit: a₁ = 8 , a₂= 8 + 2 = 10 , a₃& a₄up by 4, a₅ & a₆ up by 8 , .... by 16 a₄= 18 a₅ = 18 + 8 = 26 => answer