1. "Did you ever notice something special about those old peso notes of yours?" Alan asked. "I mean, their 8-digit serial numbers." Mike smiled. "Certainly, and that's partly why I keep them," he replied. "They're both perfect squares, and each has its first half just one more than its second half." Quite a coincidence, but be careful! What were those truly odd serial numbers?

Serial numbers 93829381 and 95439542

Serial numbers 82428241 and 98029801

Serial numbers 62626261 and 71087107