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A048557 a(1) = 1; a(n+1) is next smallest nontrivial square beginning with a(n). 7
1, 16, 169, 169744, 16974441796, 1697444179660172924176, 16974441796601729241768240010144800000000001, 1697444179660172924176824001014480000000000182400101448000000000020000000000000000000001 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Next terms are 176, 351 and 702 digits long.
LINKS
Robert G. Wilson v, Table of n, a(n) for n = 1..11
MATHEMATICA
$MaxExtraPrecision = 2^10; a[n_] := a[n] = Block[{k = 10, m = a[n - 1]}, id = IntegerDigits@ m; lng = Length@ id; While[c = Ceiling[ Sqrt[ m*k]]^2; Take[ IntegerDigits@ c, lng] != id, k *= 100]; Min[c, (Sqrt[m]*10^(lng/2) + 1)^2]]; a[1] = 1; Array[a, 11] (* Robert G. Wilson v, Dec 18 2014 *)
CROSSREFS
Cf. A048558, A050628, A061110. See A048558 for the square roots.
Sequence in context: A242078 A264092 A050628 * A174645 A021424 A200673
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, May 15 1999
STATUS
approved

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)