-analogue of a binomial coefficient congruence.
We give several different -analogues of the following two congruences of Z.-W. Sun: where is an odd prime, is a positive integer, and is the Jacobi symbol. The proofs of them require the use of some curious -series identities, two of which are related to Franklin’s involution on partitions into distinct parts. We also confirm a conjecture of the latter author and Zeng in 2012.