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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 (list; graph; refs; listen; history; text; internal format)
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: A297285 A115776 A095783 * A115801 A318992 A324970

Adjacent sequences:  A067397 A067398 A067399 * A067401 A067402 A067403

KEYWORD

nonn

AUTHOR

Jens Voß, Jan 24 2002

STATUS

approved

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Last modified July 13 13:48 EDT 2020. Contains 335688 sequences. (Running on oeis4.)