Values of Modular Polynomials modulo primes

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We gave an algorithm to compute the modular equation <pn(X,j) of j(z) in [4]. Using the data accumulated we have found some congruences of values <Pn (i, k) modulo a few primes. For example, <pn(-1, -1) == 0 mod 7 for all nand <pn(i, -1) == 1 mod 7 (0 :s i :s 5) for all n satisfying deg <P n == 0 mod 6. Knowledge about supersingular elliptic curves enables us to give a proof of those facts. Some related problems are also discussed. In the Appendix, tables of values of <Pn (i, k) mod 7 are given for several n.

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