

A340304


Numbers k such that k and the next three numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.


0




OFFSET

1,1


COMMENTS

The analogous sequence with the next four numbers after k begins with 2646000, 15876000, ...


LINKS



EXAMPLE

529200 = 2^4 * 3^3 * 5^2 * 7^2 is a term since 529200 and the next three numbers with the same prime signature as 529200, 793800 = 2^3 * 3^4 * 5^2 * 7^2, 882000 = 2^4 * 3^2 * 5^3 * 7^2, and 1234800 = 2^4 * 3^2 * 5^2 * 7^3, have the same set of distinct prime divisors, {2, 3, 5, 7}.


CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



