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A218720
a(n) is smallest number such that a(n)^2 + 1 is divisible by 101^n.
0
0, 10, 515, 296344, 35764191, 1108900220, 316411915250, 47023298541694, 3156215819652023, 310872228812491206, 28124944860980892220, 3783840171259076226254, 208193145695151069244665, 19364218657938636320485082, 663491749602035014400202724
OFFSET
0,2
EXAMPLE
a(3) = 296344 because 296344^2+1 = 101 ^ 3 * 85237.
MATHEMATICA
b=10; n101=101; jo=Join[{0, b}, Table[n101=101*n101; b=PowerMod[b, 101, n101]; b=Min[b, n101-b], {99}]]
KEYWORD
nonn
AUTHOR
Michel Lagneau, Nov 04 2012
STATUS
approved