A335231 Numbers that are the sum of 3 refactorable numbers in exactly one way.

3, 4, 5, 6, 10, 13, 14, 15, 16, 17, 23, 24, 30, 31, 41, 47, 52, 55, 68, 71, 79, 95, 103, 119, 127, 143, 151, 167, 171, 175, 179, 187, 191, 195, 199, 203, 211, 215, 223, 227, 247, 271, 275, 291, 295, 311, 327, 335, 367, 391, 415, 431, 435, 551, 559, 607, 775, 983, 1031

Offset

1,1

Links

Table of n, a(n) for n=1..59.

Eric Weisstein's World of Mathematics, Refactorable Number

Example

6 is in the sequence since it is the sum of 3 refactorable numbers in exactly one way, 6 = 2 + 2 + 2.
10 is in the sequence since it is the sum of 3 refactorable numbers in exactly one way, 10 = 1 + 1 + 8.

Crossrefs

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

Sequence in context: A219041 A218946 A174057 * A164977 A103033 A099561

Adjacent sequences: A335228 A335229 A335230 * A335232 A335233 A335234

Keyword

nonn

Author

Wesley Ivan Hurt, Jun 09 2020

Status

approved