# Aperiodic sums of roots of unity that are zero. # Format: # k: [bit-string] n [subset] # k is the rank of the necklace in lex order # (starting with k=1 for the all-zero word), # n is the length of the necklace. # # For example, the line # 6: ...11..1..11 12 0 1 4 7 8 # says that Z:=w^0+w^1+w^4+w^7+w^8==0 where w := exp(2*Pi*I/12) # # Such sums Z exist for the following n: # n: 1, 12, 18, 20, 24, 28, 30, 36, 40, 42, 44, 45, # numof(Z) 1, 2, 24, 6, 236, 18, 3768, 20384, 7188, 227784, 186, 481732448, # The list is complete for 1