What comes next?

[Gil]

Thanks again to all contributers.

Just test Gilles' astonishing compact and extremely fast program : less than 0.05 second vs several minutes with my program to get the next number after { 17 72 97 8 32 15 63 97 57 60 83 48 26 12 62 3 49 55 77 97 98 0 89 57 34 92 29 75 13 40 3 2 3 83 69 1 48 87 27 54 92 3 67 28 97 56 63 }, which is -313323742215540.

Congratulations!