A070713 Integers whose sum of digits as well as product of digits is a nonzero square.

1, 4, 9, 22, 88, 144, 414, 441, 466, 646, 664, 889, 898, 988, 1111, 1177, 1224, 1242, 1339, 1393, 1422, 1717, 1771, 1933, 2124, 2142, 2214, 2241, 2266, 2338, 2383, 2412, 2421, 2626, 2662, 2833, 3139, 3193, 3238, 3283, 3319, 3328, 3355, 3382, 3391, 3535

Offset: 1

Author

John E. Lenz (jel5010(AT)yahoo.com), May 13 2002

Keywords

• nonn
• base

Examples

			3931 is a member of this sequence as 3+9+3+1=16=4^2 and 3*9*3*1=81=9^2.
		

Crossrefs

Cf. A028839.