A038397 Concatenate first n squares in reverse order.

1, 41, 941, 16941, 2516941, 362516941, 49362516941, 6449362516941, 816449362516941, 100816449362516941, 121100816449362516941, 144121100816449362516941, 169144121100816449362516941, 196169144121100816449362516941, 225196169144121100816449362516941

Offset: 1

Author

M. I. Petrescu (mipetrescu(AT)yahoo.com)

Keywords

• nonn
• base

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

Crossrefs

Cf. A000290, A019521.

Programs

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

Maple

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 *)