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Search: id:A078865
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| A078865 |
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Difference of consecutive primorial numbers divided by 4. |
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+0
1
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| 1, 6, 45, 525, 6930, 120120, 2297295, 53348295, 1561650090, 48522699225, 1805044411170, 74207381348100, 3194627767035705, 150451755314205345, 7993567173650388330, 472542797919255648585, 28841405252313189586050
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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n=3:(210-30)/4=45=a[3]
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MATHEMATICA
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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
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Cf. A002110, A016825.
Sequence in context: A097814 A084064 A109516 this_sequence A160492 A086721 A145002
Adjacent sequences: A078862 A078863 A078864 this_sequence A078866 A078867 A078868
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KEYWORD
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easy,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Dec 16 2002
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