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A078865
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Difference of consecutive primorial numbers divided by 4.
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0
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1, 6, 45, 525, 6930, 120120, 2297295, 53348295, 1561650090, 48522699225, 1805044411170, 74207381348100, 3194627767035705, 150451755314205345, 7993567173650388330, 472542797919255648585, 28841405252313189586050
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| n=3:(210-30)/4=45=a[3]
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MATHEMATICA
| q[x_] := Apply[Times, Table[Prime[j], {j, 1, x}]] Table[(q[w+1]-q[w])/4, {w, 1, 20}]
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CROSSREFS
| Cf. A002110, A016825.
Sequence in context: A084064 A186925 A109516 * A160492 A086721 A145002
Adjacent sequences: A078862 A078863 A078864 * A078866 A078867 A078868
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KEYWORD
| easy,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 16 2002
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