Product of digits of n is a nonzero single-digit square.

Terms

a(0) =1a(1) =4a(2) =9a(3) =11a(4) =14a(5) =19a(6) =22a(7) =33a(8) =41a(9) =91a(10) =111a(11) =114a(12) =119a(13) =122a(14) =133a(15) =141a(16) =191a(17) =212a(18) =221a(19) =313a(20) =331a(21) =411a(22) =911a(23) =1111a(24) =1114a(25) =1119a(26) =1122a(27) =1133a(28) =1141a(29) =1191