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A070713 Integers whose sum of digits as well as product of digits is a nonzero square. 0
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

Sequence in context: A231213 A231338 A257272 * A060250 A138991 A138990

Adjacent sequences:  A070710 A070711 A070712 * A070714 A070715 A070716

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved

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Last modified December 13 22:55 EST 2019. Contains 329974 sequences. (Running on oeis4.)