The sequence 66, 58, 49, 41, 32 follows a pattern involving squares. The differences are: 58-66=-8, 49-58=-9, 41-49=-8, 32-41=-9. The pattern alternates between subtracting 8 and 9. Next should be -8, giving 32-8=24. Alternatively, these can be related to decreasing squares: 66=8²+2, 58=7²+9, 49=7², 41=6²+5, 32=... but the alternating -8,-9 pattern is more consistent.