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A243307 a(n) = 2^phi(n) + phi(n). 1
3, 3, 6, 6, 20, 6, 70, 20, 70, 20, 1034, 20, 4108, 70, 264, 264, 65552, 70, 262162, 264, 4108, 1034, 4194326, 264, 1048596, 4108, 262162, 4108, 268435484, 264, 1073741854, 65552, 1048596, 65552, 16777240, 4108, 68719476772, 262162, 16777240, 65552 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = A066781(n) + A000010(n). - Wesley Ivan Hurt, Jun 04 2014

EXAMPLE

From Muniru A Asiru, Jan 23 2018: (Start)

phi(1) = 1 -> a(1) = 2^1 + 1 = 3.

phi(2) = 1 -> a(2) = 2^1 + 1 = 3.

phi(7) = 6 -> a(7) = 2^6 + 6 = 70.

phi(10) = 4 -> a(10) = 2^4 + 4 = 20.

(End)

MAPLE

with(numtheory); A243307:=n->2^phi(n)+phi(n); seq(A243307(n), n=1..50); # Wesley Ivan Hurt, Jun 04 2014

MATHEMATICA

Table[2^EulerPhi[n] + EulerPhi[n], {n, 1, 50}]

PROG

(MAGMA) [2^EulerPhi(n)+EulerPhi(n): n in [1..40]];

(GAP) List([1..1000], n -> 2^Phi(n) + Phi(n)); # Muniru A Asiru, Jan 23 2018

CROSSREFS

Cf. A066781, A100371.

Sequence in context: A280510 A292128 A117775 * A021301 A016652 A008867

Adjacent sequences:  A243304 A243305 A243306 * A243308 A243309 A243310

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Jun 04 2014

STATUS

approved

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Last modified December 12 12:50 EST 2019. Contains 329958 sequences. (Running on oeis4.)