A087673 a(n) is smallest number m such that (m = product of n primes, not necessarily distinct ones) and all divisors of m are lucky numbers.

3, 9, 63, 61383

Offset

1,1

Links

Table of n, a(n) for n=1..4.

Example

E.g. a(2) = 3*3 = 9: divisors of 9 are 1, 3, 9, all of which are lucky numbers.

Crossrefs

Cf. A057600, A000959.

Sequence in context: A144525 A276535 A228776 * A046239 A093351 A018543

Adjacent sequences: A087670 A087671 A087672 * A087674 A087675 A087676

Keyword

nonn

Author

Vit Planocka (planocka(AT)mistral.cz), Sep 26 2003

Status

approved