a(1)=1. a(n) = the smallest integer > a(n-1) such that |d(a(n)) - d(a(n-1))| = n-1, where d(m) = the number of positive divisors of m.

A139695

a(1)=1. a(n) = the smallest integer > a(n-1) such that |d(a(n)) - d(a(n-1))| = n-1, where d(m) = the number of positive divisors of m.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =64a(4) =121a(5) =128a(6) =131a(7) =196a(8) =65536a(9) =65541a(10) =65572a(11) =117649a(12) =262144a(13) =262148a(14) =262192a(15) =279841a(16) =287296a(17) =287299a(18) =287744a(19) =292681a(20) =4194304a(21) =4194319a(22) =4194325

External references