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A084313
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a(n)=x is the smallest number such that gcd(prime(x)-1, x) = n.
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3
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1, 2, 21, 16, 5, 6, 315, 24, 63, 20, 121, 12, 65, 14, 105, 320, 697, 306, 2185, 60, 399, 286, 299, 216, 575, 156, 513, 644, 1189, 210, 837, 384, 231, 374, 1505, 684, 3515, 1026, 1131, 1480, 2747, 966, 1591, 1012, 1935, 782, 1645, 1776, 30429, 7600, 3009
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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f[x_] := GCD[Prime[x]-1, x] t=Table[0, {256}]; Do[s=f[n]; If[s<257&&t[[s]]==0, t[[s]]=n], {n, 1, 100000}]; t
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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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