Powerful(1) numbers (A001694) whose digit reversal is a pentagonal number (A000326).

Terms

a(0) =1a(1) =100a(2) =500a(3) =529a(4) =1000a(5) =1089a(6) =2116a(7) =5000a(8) =6241a(9) =10000a(10) =50000a(11) =52900a(12) =100000a(13) =103041a(14) =108900a(15) =151875a(16) =211600a(17) =500000a(18) =529000a(19) =549152a(20) =624100a(21) =1000000a(22) =1089000a(23) =2116000a(24) =5000000a(25) =5290000a(26) =6241000a(27) =10000000