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A019521
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Concatenate squares.
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11
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1, 14, 149, 14916, 1491625, 149162536, 14916253649, 1491625364964, 149162536496481, 149162536496481100, 149162536496481100121, 149162536496481100121144, 149162536496481100121144169, 149162536496481100121144169196, 149162536496481100121144169196225
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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a(3)=149 is the only prime up to n=4000. - Daniel Arribas, Jun 04 2016
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REFERENCES
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S. Smarandoiu, Convergence of Smarandache continued fractions, Abstract 96T-11-195, Abstracts Amer. Math. Soc., Vol. 17, No. 4 (1996), p. 680.
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LINKS
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MAPLE
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a:= proc(n) a(n):= `if`(n=1, 1, parse(cat(a(n-1), n^2))) end:
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PROG
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(Haskell)
a019521 n = a019521_list !! (n-1)
a019521_list = f "" $ tail a000290_list where
f xs (q:qs) = (read ys :: Integer) : f ys qs
where ys = xs ++ show q
(Python)
def a(n): return int("".join(str(i*i) for i in range(1, n+1)))
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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R. Muller
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STATUS
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approved
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