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Numbers that are the sum of 3 refactorable numbers in exactly one way.
1

%I #15 Feb 16 2025 08:34:00

%S 3,4,5,6,10,13,14,15,16,17,23,24,30,31,41,47,52,55,68,71,79,95,103,

%T 119,127,143,151,167,171,175,179,187,191,195,199,203,211,215,223,227,

%U 247,271,275,291,295,311,327,335,367,391,415,431,435,551,559,607,775,983,1031

%N Numbers that are the sum of 3 refactorable numbers in exactly one way.

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RefactorableNumber.html">Refactorable Number</a>

%e 6 is in the sequence since it is the sum of 3 refactorable numbers in exactly one way, 6 = 2 + 2 + 2.

%e 10 is in the sequence since it is the sum of 3 refactorable numbers in exactly one way, 10 = 1 + 1 + 8.

%Y Cf. A000005 (tau), A033950 (refactorable numbers), A335230.

%K nonn,changed

%O 1,1

%A _Wesley Ivan Hurt_, Jun 09 2020