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A019521 Concatenate squares. 5
1, 14, 149, 14916, 1491625, 149162536, 14916253649, 1491625364964, 149162536496481, 149162536496481100, 149162536496481100121, 149162536496481100121144, 149162536496481100121144169 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(2)=149 is the only prime up to n=4000. - Daniel Arribas, Jun 04 2016

REFERENCES

S. Smarandoiu, Convergence of Smarandache continued fractions, Abstract 96T-11-195, Abstracts Amer. Math. Soc., 17 (No. 4, 1996), 680.

Y. Guo, M. Le, Smarandache Concatenated Power Decimals and Their Irrationality, Smarandache Notions Journal, Vol. 9, No. 1-2. 1998, 100-102.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..225

F. Smarandache, Collected Papers, Vol. II

Eric Weisstein's World of Mathematics, Consecutive Number Sequences

FORMULA

a(n) = a(n-1)*10^floor[1+log10(n^2)]+n^2, with a(1)=1. - Paolo P. Lava, Jun 20 2008

MAPLE

P:=proc(i) local a, n; a:=1; for n from 2 by 1 to i do a:=a*10^floor(evalf(1+log10(n^2), 1000))+n^2; print(a); od; end: P(100); # Paolo P. Lava, Jun 20 2008

PROG

(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

-- Reinhard Zumkeller, Mar 01 2014

CROSSREFS

Cf. A000290, A038397.

Sequence in context: A081184 A032343 A222614 * A009614 A009802 A153598

Adjacent sequences:  A019518 A019519 A019520 * A019522 A019523 A019524

KEYWORD

base,nonn

AUTHOR

R. Muller

STATUS

approved

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Last modified December 4 17:40 EST 2016. Contains 278755 sequences.