A070713 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..46.

EXAMPLE

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.

Sequence in context: A257272 A370021 A374055 * A060250 A138991 A361002

Adjacent sequences: A070710 A070711 A070712 * A070714 A070715 A070716

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved