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A301812
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Numbers of the form p^2 - 1 where p is a prime of the form 3*k-1 (A003627).
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0
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3, 24, 120, 288, 528, 840, 1680, 2208, 2808, 3480, 5040, 6888, 7920, 10200, 11448, 12768, 17160, 18768, 22200, 27888, 29928, 32040, 36480, 38808, 51528, 54288, 57120, 63000, 66048, 69168, 72360, 78960, 85848, 96720, 100488, 120408, 124608, 128880, 146688
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listen;
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OFFSET
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1,1
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LINKS
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FORMULA
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MAPLE
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A301812List := proc(len) local p, n, L; L := 3; p := 5;
for n from 2 to len do if isprime(p) then L := L, (p^2 - 1) fi;
p := p + 6; od: L end:
A301812List(65);
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MATHEMATICA
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Flatten[Table[n^2 - 1, {n, {2, Select[Range[5, 385, 6], PrimeQ]}}]]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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