OFFSET
0,2
COMMENTS
A number's prime signature (row n of A124010) is the sequence of positive exponents in its prime factorization.
LINKS
Mathematics Stack Exchange, What is a sequence run? (answered 2011-12-01)
EXAMPLE
The prime indices of 90 are {1,2,2,3}, with multiplicities {1,2,1}, with runs {{1},{2},{1}}, and this is the first case of 3 runs, so a(3) = 90.
MATHEMATICA
Table[Product[Prime[i]^If[EvenQ[n-i], 1, 2], {i, n}], {n, 0, 15}]
CROSSREFS
Positions of first appearances in A353745.
KEYWORD
nonn
AUTHOR
Gus Wiseman, May 20 2022
STATUS
approved