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A067401 Minimal non-uniquely factorizable OR-numbrals, i.e., numbrals that are not uniquely factorizable but for which all proper divisors are. 4
15, 85, 95, 111, 123, 125, 175, 191, 207, 223, 239, 243, 245, 247, 251, 253, 351, 367, 379, 381, 399, 415, 443, 445, 447, 463, 483, 487, 493, 499, 501, 507, 585, 603, 621, 631, 639, 685, 687, 701, 725, 729, 731, 735, 757, 763, 783, 799, 827, 831, 873, 877 (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..52.

EXAMPLE

15 is in A067401 since [15] = [3] * [5] = [3]^3 all divisors of [15] are uniquely factorizable.

CROSSREFS

Cf. A003986, A007059, A048888, A067138, A067139, A067398, A067399, A067400.

Sequence in context: A206383 A020136 A176033 * A206169 A160599 A091286

Adjacent sequences:  A067398 A067399 A067400 * A067402 A067403 A067404

KEYWORD

nonn

AUTHOR

Jens Voß, Jan 24 2002

STATUS

approved

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Last modified July 14 16:21 EDT 2020. Contains 335729 sequences. (Running on oeis4.)