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A217761 Numbers whose square has a square number of decimal digits. 1
0, 1, 2, 3, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..67.

EXAMPLE

32^2 is 1024, which has 2^2 = 4 digits.

PROG

(R) sq=(1:10)^2; sqsqd=c(); i=0; while(length(sqsqd)<500) { if(floor(log10(i^2)+1)%in%sq) sqsqd=c(sqsqd, i); i=i+1 }

CROSSREFS

Cf. A000290, A179935.

Sequence in context: A128030 A239593 A214658 * A004843 A173353 A032815

Adjacent sequences:  A217758 A217759 A217760 * A217762 A217763 A217764

KEYWORD

nonn,easy,base

AUTHOR

Kevin L. Schwartz and Christian N. K. Anderson, Mar 23 2013

STATUS

approved

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Last modified July 17 20:45 EDT 2019. Contains 325109 sequences. (Running on oeis4.)