A131997 - OEIS

A131997

Array read by rows in which the n-th row contains odd numbers of all possible prime signatures with n divisors.

%I #5 Feb 20 2019 05:34:43

%S 1,3,9,27,15,81,243,45,729,2187,135,105,6561,225,19683,405,59049,

%T 177147,1215,315,675

%N Array read by rows in which the n-th row contains odd numbers of all possible prime signatures with n divisors.

%e Row 12 of A131886 is 2048 96 72 60 so here row 12 is 177147 1215 315 675.

%Y Cf. A001055, A025487, A050322, A057567, A077569, A108464, A122819, A130839, A131802, A131886.

%K nonn,tabf,more

%O 1,2

%A _Alford Arnold_, Aug 18 2007