Post #2021697
2026-05-01 05:07 UTC
I feel this would appeal to @standupmaths: ISBN-10 numbers with the same check digit upon conversion to ISBN-13.
https://oeis.org/A393653
#OEIS
Replies (1)
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@bstacey@icosahedron.website 2026-05-01 05:54
@christianp @standupmaths And *Calculus Made Easy* is an example! Neat! :-)