I must not understand the rules. Is it not the smallest number whose digits multiply to give the previous one? On Fri, Jul 26, 2019 at 3:57 PM Allan Wechsler <acwacw@gmail.com> wrote:
Because 1449=3^2*7*23 is not 7-smooth, so it does not permit an extension.
On Fri, Jul 26, 2019, 5:27 PM Mike Stay <metaweta@gmail.com> wrote:
Why 1944 and not 1449?
On Fri, Jul 26, 2019 at 12:30 AM Éric Angelini <eric.angelini@skynet.be> wrote:
5 terms (with my smartphone)! 6,16,144,1944,3899,... Best, É.
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