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A078423 Group the natural numbers into clumps with increasing prime numbers of elements, then multiply the members of each clump. 0
2, 60, 30240, 98017920, 857180548224000, 109720581991308288000, 70265584374661732509573120000, 61765285634580106110458762035200000, 642817384174195049892129048242945261568000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

EXAMPLE

Dividing 1,2,3,4,5,6,7,8,9,10,... into clumps of 2,3,5,.. elements: {1,2}, {3,4,5}, {6,7,8,9,10}, ... and then multiply each clumps to get 2,60,30240,...

CROSSREFS

Cf. A034956.

Sequence in context: A056923 A173221 A082787 * A231024 A121493 A078491

Adjacent sequences:  A078420 A078421 A078422 * A078424 A078425 A078426

KEYWORD

nonn

AUTHOR

Lior Manor Dec 29 2002

STATUS

approved

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Last modified February 26 03:29 EST 2020. Contains 332273 sequences. (Running on oeis4.)