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A115537 Numbers k such that the concatenation of 4*k with k gives a square. 0
17728531856, 27700831025, 39889196676, 54293628809, 70914127424, 89750692521, 32653061224489796, 73469387755102041, 1245674740484429065743944636678200692041522491349481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

70914127424_17728531856 = 84210526316^2.

CROSSREFS

Cf. A102567, A106497, A115527 - A115556.

Sequence in context: A233799 A330278 A202724 * A233486 A270895 A273186

Adjacent sequences:  A115534 A115535 A115536 * A115538 A115539 A115540

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 25 2006

STATUS

approved

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Last modified August 13 18:03 EDT 2022. Contains 356107 sequences. (Running on oeis4.)