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A124691
a(n) = lcm(prime(n)+1, prime(n+1)+1) / 2.
0
6, 6, 12, 12, 42, 63, 90, 60, 60, 240, 304, 399, 462, 264, 216, 270, 930, 1054, 612, 1332, 1480, 840, 630, 2205, 2499, 2652, 1404, 2970, 3135, 3648, 2112, 1518, 4830, 1050, 5700, 6004, 6478, 3444, 2436, 2610, 8190, 8736, 9312, 9603, 9900, 5300, 5936, 6384
OFFSET
1,1
FORMULA
a(n) = (1/2)*lcm(1+A000040(n), 1+A000040(1+n)).
MATHEMATICA
f[n_] := LCM [Prime[n] + 1, Prime[n + 1] + 1]/2; Table[f@n, {n, 48}] (* Robert G. Wilson v, Jun 28 2007 *)
CROSSREFS
Sequence in context: A315785 A127402 A161418 * A315786 A112437 A122223
KEYWORD
easy,nonn
AUTHOR
Philippe LALLOUET (philip.lallouet(AT)wanadoo.fr), Jun 26 2007
EXTENSIONS
More terms from Robert G. Wilson v, Jun 28 2007
STATUS
approved