Twin composites are pairs of composite numbers 
, defined by analogy with twin
primes. Every even number 
gives such a pair, so it is natural to consider odd
twin composites. These pairs bracket an even number 
.
The first few odd twin composites are (25, 27), (33, 35), (49, 51), (55, 57), (63, 65), (75, 77), (85, 87), (91, 93), (93, 95), .... Their smaller members give OEIS A269345, while their larger members give the odd terms of OEIS A025583. Their midpoints are 26, 34, 50, 56, 64, 76, 86, 92, 94, 116, 118, ... (OEIS A061673).
