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A102904
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Primes of the form 3^n+20=3^n+19+1.
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23, 29, 47, 101, 263, 2207, 6581, 59069, 177167, 4782989, 984770902183611232901, 174449211009120179071170527, 278128389443693511257285776231781, 7509466514979724803946715958257567
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