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

1,1

Comments

See A048888 for the definition of OR-numbral arithmetic.

Links

Table of n, a(n) for n=1..53.

Example

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.

Sequence in context: A115776 A095783 A348556 * A115801 A343343 A318992

Adjacent sequences: A067397 A067398 A067399 * A067401 A067402 A067403

Keyword

nonn

Author

Jens Voß, Jan 24 2002

Status

approved