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 A038397 Concatenate first n squares in reverse order. 14
 1, 41, 941, 16941, 2516941, 362516941, 49362516941, 6449362516941, 816449362516941, 100816449362516941, 121100816449362516941, 144121100816449362516941, 169144121100816449362516941, 196169144121100816449362516941, 225196169144121100816449362516941 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES Mihaly Bencze [Beneze], L. Tutescu, Some Notions and Questions in Number Theory, Sequence 5. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..225 FORMULA a(n) = (n^2)*10^floor(1 + log_10(a(n-1))) + a(n-1), with a(1) = 1. - Paolo P. Lava, Jun 20 2008 MAPLE P:=proc(i) local a, n; a:=1; print(1); for n from 2 by 1 to i do a:=n^2*10^floor(evalf(1+log10(a), 1000))+a; print(a); od; end: P(100); # Paolo P. Lava, Jun 20 2008 # second Maple program: a:= proc(n) a(n):= `if`(n=1, 1, parse(cat(n^2, a(n-1)))) end: seq(a(n), n=1..20);  # Alois P. Heinz, Jan 13 2021 MATHEMATICA Join[{s = 1}, Table[s = FromDigits[Flatten[IntegerDigits[{n^2, s}]]], {n, 2, 12}]] (* Jayanta Basu, Jul 14 2013 *) PROG (Haskell) a038397 n = a038397_list !! (n-1) a038397_list = f "" \$ tail a000290_list where    f xs (q:qs) = (read ys :: Integer) : f ys qs      where ys = show q ++ xs -- Reinhard Zumkeller, Mar 01 2014 CROSSREFS Cf. A000290, A019521. Sequence in context: A300173 A293619 A177418 * A104349 A091314 A059762 Adjacent sequences:  A038394 A038395 A038396 * A038398 A038399 A038400 KEYWORD nonn,base AUTHOR M. I. Petrescu (mipetrescu(AT)yahoo.com) STATUS approved

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Last modified April 15 01:24 EDT 2021. Contains 342974 sequences. (Running on oeis4.)