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A067400
Non-uniquely factorizable OR-numbrals, i.e., numbrals for which there exist more than one different factorizations into irreducible factors (modulo order).
4
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
1,1
COMMENTS
See A048888 for the definition of OR-numbral arithmetic.
EXAMPLE
15 is in A067400 since [15] = [3] * [5] = [3]^3 and [3] and [5] are irreducible.
KEYWORD
nonn
AUTHOR
Jens Voß, Jan 24 2002
STATUS
approved