A008468 a(n) = n OR n^3 (applied to binary expansions).

1, 10, 27, 68, 125, 222, 343, 520, 729, 1002, 1339, 1740, 2205, 2750, 3375, 4112, 4913, 5850, 6875, 8020, 9277, 10654, 12183, 13848, 15641, 17594, 19707, 21980, 24413, 27006, 29791, 32800, 35937, 39338, 42875, 46692, 50685, 54910, 59319, 64040

Offset

1,2

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10000

Maple

a:= n-> Bits[Or](n, n^3):
seq(a(n), n=1..100);  # Alois P. Heinz, Mar 29 2018

Mathematica

(* program should not be used to extend this sequence *)
d=16; Mb=Array[ 2^(d-#)&, d ]; Map[ Plus@@(Mb*#)&, Array[ IntegerDigits[ #, 2, d ]+IntegerDigits[ #^3, 2, d ]&, 40 ]/. (2->1) ]
f[n_]:=BitOr[n, n^3]; Array[f, 10000, 1] (* Vincenzo Librandi, Mar 30 2018 *)

Prog

(PARI) a(n) = bitor(n, n^3); \\ Michel Marcus, Mar 30 2018
(Magma) [BitwiseOr(n, n^3): n in [1..40]]; // Bruno Berselli, Mar 30 2018

Crossrefs

Cf. A007745, A008467, A008469.

Sequence in context: A103135 A375774 A220021 * A267217 A179546 A119548

Adjacent sequences: A008465 A008466 A008467 * A008469 A008470 A008471

Keyword

base,nonn,easy

Author

Olivier Gérard

Status

approved