OFFSET
1,2
COMMENTS
T(n,k) is the triangle in A174909 with reversed row order. (See that sequence for additional comments).
T(n,k) = number of terms with smallest prime factor prime(k) contained in primorial(n) consecutive numbers, k <= n. For example, T(5,4) = 88, so there are 88 terms with smallest prime factor 7 in any sequence of 2310 consecutive numbers.
EXAMPLE
MATHEMATICA
Table[#1 Product[EulerPhi@ Prime@ i, {i, k - 1}]/#2 & @@ Map[Product[ Prime@ i, {i, #}] &, {n, k}], {n, 8}, {k, n}] // Flatten (* Michael De Vlieger, Oct 12 2017 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Bob Selcoe, Oct 11 2017
STATUS
approved