For an integer k with prime factorization p_1*p_2*p_3* ... *p_m let k* = (p_1+1)*(p_2+1)*(p_3+1)* ... *(p_m+1) (A064478); sequence gives k such that k* is divisible by k.

A064476

For an integer k with prime factorization p_1*p_2*p_3* ... *p_m let k* = (p_1+1)*(p_2+1)*(p_3+1)* ... *(p_m+1) (A064478); sequence gives k such that k* is divisible by k.

Terms

    a(0) =1a(1) =6a(2) =12a(3) =36a(4) =72a(5) =144a(6) =216a(7) =432a(8) =864a(9) =1296a(10) =1728a(11) =2592a(12) =5184a(13) =7776a(14) =10368a(15) =15552a(16) =20736a(17) =31104a(18) =46656a(19) =62208a(20) =93312a(21) =124416a(22) =186624a(23) =248832a(24) =279936a(25) =373248a(26) =559872a(27) =746496a(28) =1119744a(29) =1492992

External references