Numbers k in A055932 such that both k-1 and k+1 are not squarefree.

Terms

a(0) =291600a(1) =1406250a(2) =2097152a(3) =13436928a(4) =34012224a(5) =36382500a(6) =46656000a(7) =180033840a(8) =393216000a(9) =1073741824a(10) =1360800000a(11) =1771470000a(12) =4900921200a(13) =8576868300a(14) =12884901888a(15) =13588459500a(16) =13608154560a(17) =17496198720a(18) =46490458680a(19) =113810780160a(20) =125475189840a(21) =141557760000a(22) =181474110720