

A093910


Product of nth row of irregular triangle defined in A093911.


3




OFFSET

1,2


COMMENTS

Next term has 168 digits.


LINKS



FORMULA



EXAMPLE

a(3) = 120 because a(1) is the product of 1 successive numbers starting with 1 = 1, and a(2) is the product of 2 successive numbers (2,3) = 6 and a(3) is the product of 3 successive numbers (4,5,6) = 120. All the products have the property that a(n) = 0 (mod a(n  1)). Thus a(3) = 120.


MATHEMATICA

a = {{1, 1}, {2, 2}}; Do[k = Last@ a[[i  1]]; While[! Divisible[Pochhammer[Total@ a[[i  1]], k], Pochhammer @@ a[[i  1]]], k++]; AppendTo[a, {Total@ a[[i  1]], k}], {i, 3, 8}]; Pochhammer @@ # & /@ a (* Michael De Vlieger, Dec 15 2016 *)


CROSSREFS



KEYWORD

nonn,easy,less


AUTHOR



EXTENSIONS



STATUS

approved



