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Triangular numbers with digits in
{0, 7, 9}
(up to 10
32
)
A218402
= n
A218401
= T(n)
44
990
426096444
90779090007770790
Next term is T(12641976109035254775) = 79909779970709079970099779979097777700, found by Max Alekseyev.
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