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A030686 Smallest nontrivial extension of n^2 which is a square. 4
16, 49, 900, 169, 256, 361, 4900, 6400, 8100, 10000, 12100, 1444, 16900, 19600, 22500, 25600, 28900, 3249, 36100, 40000, 44100, 48400, 52900, 57600, 62500, 67600, 72900, 78400, 84100, 90000, 96100, 102400, 108900, 115600, 122500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Nontrivial extension means appending at least one digit even if the number is already a square.

LINKS

Table of n, a(n) for n=1..35.

M. F. Hasler, Truncated squares, OEIS wiki, Jan 16 2012

Index to sequences related to truncating digits of squares.

FORMULA

a(n) = A030687(n)^2. - M. F. Hasler, Sep 28 2014

a(n) = A030666(n^2). - Alonso del Arte, Apr 01 2020

CROSSREFS

Cf. A030687, A023110, A031149, A031150, A202303.

See also A023110 = A031149^2 and A202303 = A031150^2 for a related concept, and cross-references there (and in links) for the analog in bases other than 10. - M. F. Hasler, Sep 28 2014

Sequence in context: A264479 A104992 A153483 * A030688 A235962 A235573

Adjacent sequences:  A030683 A030684 A030685 * A030687 A030688 A030689

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)