A340303 Numbers k such that k and the next two numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.

10800, 12600, 54000, 75600, 148176, 162000, 264600, 324000, 609840, 453600, 529200, 793800, 444528, 648000, 1058400, 1323000, 1764000, 1620000, 2116800, 2646000, 2721600, 3704400, 3969000, 6403320, 4233600, 5292000, 4860000, 6223392, 7938000, 7408800, 8467200

Offset: 1

Author

Amiram Eldar, Jan 03 2021

Keywords

• nonn

Comments

Numbers k such that A007947(k) = A007947(A081761(k)) = A007947(A081761(A081761(k))).

Examples

			10800 = 2^4 * 3^3 * 5^2 is a term since 10800 and the next two numbers with the same prime signature as 10800, 16200 = 2^3 * 3^4 * 5^2 and 18000 = 2^4 * 3^2 * 5^3, have the same set of distinct prime divisors, {2, 3, 5}.
		

Links

• Index entries for sequences related to prime signature

Crossrefs

Subsequence of A340302.

Cf. A007947, A081761, A118914.