A116190 Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 9.
16, 36, 12366, 42036, 64996, 1589736168, 1921234732, 3154856388, 3615437032, 5939192968, 6565302732, 1888656611704713276, 2251541774559900786, 2761459004510103616, 3196921199936328628, 63080834574071218603723158
Offset: 1