A116197 Numbers k such that k concatenated with k+5 gives the product of two numbers which differ by 9.
25, 2448207281, 2552334847, 9492271895, 10713024775597019390267617, 45251510049471045364918031, 99414584492459886818648287, 1000584180267191789271991959007645
Offset: 1