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A071177 Square-root of concatenation n'k, where k is minimal with n'k square (decimal notation). 1
4, 5, 6, 7, 23, 8, 27, 9, 31, 10, 34, 11, 37, 12, 39, 13, 42, 43, 14, 45, 46, 15, 152, 156, 16, 162, 165, 17, 54, 55, 56, 18, 58, 59, 188, 19, 61, 62, 63, 20, 203, 65, 66, 21, 213, 68, 69, 22, 222, 71, 72, 23, 73, 74, 235, 75, 24, 242 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = A000196(n'A071176(n))

LINKS

Table of n, a(n) for n=1..58.

EXAMPLE

a(5) = 23 as 23^2 = 529 = 5'29 and 5'i is nonsquare for i<29, A071176(5)=29.

CROSSREFS

Sequence in context: A161627 A030667 A030677 * A010754 A187807 A051036

Adjacent sequences:  A071174 A071175 A071176 * A071178 A071179 A071180

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, May 15 2002

STATUS

approved

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Last modified December 13 08:08 EST 2018. Contains 318082 sequences. (Running on oeis4.)