1,2

Multiperfect numbers

Achim Flammenkamp, The Multiply Perfect Numbers Page.

a(4)=10 because the smallest 4-perfect number factorization is 2^5*3^3*5*7 which has 10 prime factors.

Adjacent sequences: A107479 A107480 A107481 this_sequence A107483 A107484 A107485

Sequence in context: A109377 A109472 A038358 this_sequence A018315 A054964 A057752

hard,more,nonn

Jose Brox (tautocrona(AT)terra.es), May 27 2005