A067400 Non-uniquely factorizable OR-numbrals, i.e., numbrals for which there exist more than one different factorizations into irreducible factors (modulo order).

15, 30, 31, 60, 62, 63, 85, 95, 111, 120, 123, 124, 125, 126, 127, 170, 175, 190, 191, 207, 222, 223, 239, 240, 243, 245, 246, 247, 248, 250, 251, 252, 253, 254, 255, 340, 341, 350, 351, 367, 379, 380, 381, 382, 383, 399, 414, 415, 443, 444, 445, 446, 447

Offset: 1

Author

Jens Voß, Jan 24 2002

Keywords

• nonn

Comments

See A048888 for the definition of OR-numbral arithmetic.

Examples

			15 is in A067400 since [15] = [3] * [5] = [3]^3 and [3] and [5] are irreducible.
		

Crossrefs

Cf. A003986, A007059, A048888, A067138, A067139, A067398, A067399, A067401.