Apéry congruence conjecture for the second-kind numbers modulo
Apéry congruence conjecture for the second-kind numbers modulo
For , define the Apéry numbers of the second kind by
Write the ternary expansion of as a finite word over , and let be a nonnegative integer.
Second-kind Apéry congruence conjecture. The numbers satisfy the following congruences modulo :
- if and only if the ternary expansion of contains digits equal to for some , and otherwise contains only 's and 's.
- if and only if the ternary expansion of contains digits equal to for some , and otherwise contains only 's and 's.
- if and only if the ternary expansion of contains digits equal to for some , and otherwise contains only 's and 's.
- if and only if the ternary expansion of contains digits equal to for some , and otherwise contains only 's and 's.
- if and only if the ternary expansion of contains digits equal to for some , and otherwise contains only 's and 's.
- if and only if the ternary expansion of contains digits equal to for some , and otherwise contains only 's and 's.
- In all other cases, is divisible by ; in particular, for every .
As with the first-kind numbers, the relevant differential equation is not suitable for the paper's method. The patterns were obtained conjecturally modulo , and the supplied text gives no resolution.
Sources & referencesView supporting material
Primary source
Christian Krattenthaler and Thomas W. Müller, “A method for deterining the mod-3^k behaviour of recursive sequences”, arXiv:1308.2856 (2013).
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