Squares Ending in 5 Occurrences of 2-Digit Pattern/Historical Note
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Historical Note on Squares Ending in 5 Occurrences of 2-Digit Pattern
According to David Wells in his $1997$ book Curious and Interesting Numbers, 2nd ed., this result is attributed to J.A.H. Hunter, in volume $6$ of the Journal of Recreational Mathematics.
No online corroboration of this can be found online, as there appears to be no consolidated archive of this magazine.
The author of this page would give his right arm to have a copy of the entire series resting on a bookshelf in his study.