A128646
a(n) = denominator(Sum_{k=1..n} 1/(prime(k)-1)).
Original entry on oeis.org
1, 2, 4, 12, 60, 10, 80, 720, 7920, 55440, 55440, 18480, 18480, 18480, 425040, 5525520, 160240080, 53413360, 160240080, 160240080, 480720240, 480720240, 19709529840, 19709529840, 39419059680, 197095298400, 3350620072800
Offset: 1
Cf.
A120271 (numerator(Sum_{k=1..n} 1/(prime(k)-1))).
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Table[Denominator[Sum[1/(Prime[k]-1),{k,1,n}]],{n,1,36}]
A128647
a(n) = numerator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1)).
Original entry on oeis.org
1, 1, 3, 7, 41, 3, 53, 437, 5167, 34189, 36037, 3833, 3987, 11521, 274223, 3458639, 103063291, 100392623, 34273501, 33510453, 308270747, 302107667, 12626774467, 12402802537, 25216220279, 124110148411, 2142721739387, 111888942151111
Offset: 1
Cf.
A128648 (denominator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1))).
Cf.
A120271 (numerator(Sum_{k=1..n} 1/(prime(k)-1))).
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Table[Numerator[Sum[(-1)^(k+1)*1/(Prime[k]-1),{k,1,n}]],{n,1,36}]
A128648
a(n) = denominator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1)).
Original entry on oeis.org
1, 2, 4, 12, 60, 5, 80, 720, 7920, 55440, 55440, 6160, 6160, 18480, 425040, 5525520, 160240080, 160240080, 53413360, 53413360, 480720240, 480720240, 19709529840, 19709529840, 39419059680, 197095298400, 3350620072800, 177582863858400
Offset: 1
Cf.
A128647 (numerator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1))).
Cf.
A128646 (denominator(Sum_{k=1..n} 1/(prime(k)-1))).
-
Table[Denominator[Sum[(-1)^(k+1)*1/(Prime[k]-1),{k,1,n}]],{n,1,36}]
Showing 1-3 of 3 results.
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