A078865 Difference of consecutive primorial numbers divided by 4.

1, 6, 45, 525, 6930, 120120, 2297295, 53348295, 1561650090, 48522699225, 1805044411170, 74207381348100, 3194627767035705, 150451755314205345, 7993567173650388330, 472542797919255648585, 28841405252313189586050

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..349

Example

n=3:(210-30)/4=45=a[3]

Mathematica

q[x_] := Apply[Times, Table[Prime[j], {j, 1, x}]] Table[(q[w+1]-q[w])/4, {w, 1, 20}]
Differences[FoldList[Times, Prime[Range[20]]]]/4 (* Harvey P. Dale, Sep 09 2019 *)

Crossrefs

Cf. A002110, A016825.

Sequence in context: A346682 A109516 A245493 * A160492 A318017 A356487

Adjacent sequences: A078862 A078863 A078864 * A078866 A078867 A078868

Keyword

easy,nonn

Author

Labos Elemer, Dec 16 2002

Status

approved