A318466 a(n) = 2*n OR A000203(n), where OR is bitwise-or (A003986) and A000203 = sum of divisors.

3, 7, 6, 15, 14, 12, 14, 31, 31, 22, 30, 28, 30, 28, 30, 63, 50, 39, 54, 42, 42, 44, 62, 60, 63, 62, 62, 56, 62, 124, 62, 127, 114, 118, 118, 91, 110, 124, 126, 90, 122, 116, 126, 92, 94, 92, 126, 124, 123, 125, 110, 106, 126, 124, 110, 120, 114, 126, 126, 248, 126, 124, 126, 255, 214, 148, 198, 254, 234, 156, 206

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for sequences related to binary expansion of n

Index entries for sequences related to sigma(n)

Formula

a(n) = A003986(2*n, A000203(n)).

a(n) = A224880(n) - A318468(n).

Mathematica

Array[BitOr[2 #, DivisorSigma[1, #]] &, 71] (* Michael De Vlieger, Mar 30 2019 *)

Prog

(PARI) A318466(n) = bitor(2*n, sigma(n));
(Python)
from sympy import divisor_sigma
def A318466(n): return (n<<1)|int(divisor_sigma(n)) # Chai Wah Wu, Jul 10 2022

Crossrefs

Cf. A000203, A003986, A224880, A318467, A318468.

Cf. also A318456.

Sequence in context: A109635 A095360 A175142 * A324819 A217112 A241016

Adjacent sequences: A318463 A318464 A318465 * A318467 A318468 A318469

Keyword

nonn,look,base

Author

Antti Karttunen, Aug 26 2018

Status

approved