A067401 Minimal non-uniquely factorizable OR-numbrals, i.e., numbrals that are not uniquely factorizable but for which all proper divisors are.

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

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