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A218710
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a(n) is smallest number such that a(n)^2 + 1 is divisible by 17^n.
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9
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0, 4, 38, 1985, 27493, 390112, 390112, 96940388, 3379649772, 24306922095, 450044583893, 5597937117454, 28673959190179, 3524407382568745, 13428985415474682, 13428985415474682, 5711417117604156904, 91610966633729580058, 6709533061724423693474
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OFFSET
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0,2
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LINKS
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EXAMPLE
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a(4) = 27493 because 27493^2+1 = 2 * 5 ^ 2 * 17 ^ 4 * 181.
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MATHEMATICA
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b=4; n17=17; jo=Join[{0, b}, Table[n17=17*n17; b=PowerMod[b, 17, n17]; b=Min[b, n17-b], {99}]]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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