The Next number in series is 326
89,234,263,312,..
8^2+9^2=145 + 89 = 234 2^2+3^2+4^2=4+9+16=29+234=263 2^2+6^2+3^2=4+36+9=49+263=312 similarly, 3^2+1^2+2^2=9+1+4=14+312=326