31 Oct
2019
31 Oct
'19
7:15 p.m.
Eventually almost all numbers are orphans, because there are some impossible substrings, like 919, and any number containing the bad substring is also an orphan. And the fraction of numbers containing any single substring rises asymptotically to 1 (albeit usually slowly). On Thu, Oct 31, 2019 at 2:59 PM Hans Havermann <gladhobo@bell.net> wrote:
EA: "Orphan numbers are integers with no father, like 919 or [68956]. Is a list of such orphan numbers already in the OEIS?"
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