A171687 a(n) = (10^n)^4+(10^n+1)^4.

17, 24641, 204060401, 2004006004001, 20004000600040001, 200004000060000400001, 2000004000006000004000001, 20000004000000600000040000001, 200000004000000060000000400000001, 2000000004000000006000000004000000001, 20000000004000000000600000000040000000001, 200000000004000000000060000000000400000000001

Offset

0,1

Links

Paolo Xausa, Table of n, a(n) for n = 0..200

Index entries for linear recurrences with constant coefficients, signature (11111,-11222110,1122211000,-11111000000,10000000000).

Mathematica

A171687[n_] := 10^(4*n) + (10^n + 1)^4; Array[A171687, 15, 0] (* Paolo Xausa, Mar 08 2026 *)

Crossrefs

Sequence in context: A283719 A355465 A134360 * A178050 A110915 A387217

Adjacent sequences: A171684 A171685 A171686 * A171688 A171689 A171690

Keyword

easy,nonn

Author

Jason Earls, Dec 15 2009

Extensions

More terms from Paolo Xausa, Mar 08 2026

Status

approved