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A285702 a(n) = A000010(A064216(n)). 2
1, 1, 2, 4, 2, 6, 10, 2, 12, 16, 4, 18, 6, 4, 22, 28, 6, 8, 30, 10, 36, 40, 4, 42, 20, 12, 46, 12, 16, 52, 58, 8, 20, 60, 18, 66, 70, 6, 24, 72, 8, 78, 24, 22, 82, 40, 28, 32, 88, 12, 96, 100, 8, 102, 106, 30, 108, 36, 20, 48, 42, 36, 18, 112, 40, 126, 64, 8, 130, 136, 42, 60, 44, 20, 138, 148, 24, 56, 150, 46, 72, 156, 12, 162, 110, 32, 166, 24, 52, 172, 178 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000010(A064216(n)).

MATHEMATICA

Table[EulerPhi@ If[n == 1, 1, Apply[Times, FactorInteger[2 n - 1] /. {p_, e_} /; p > 2 :> NextPrime[p, -1]^e]], {n, 91}] (* Michael De Vlieger, Apr 26 2017 *)

PROG

(Scheme) (define (A285702 n) (A000010 (A064216 n)))

CROSSREFS

Cf. A000010, A064216, A099774, A285703.

Sequence in context: A026251 A205721 A085190 * A104000 A199943 A335340

Adjacent sequences:  A285699 A285700 A285701 * A285703 A285704 A285705

KEYWORD

nonn

AUTHOR

Antti Karttunen, Apr 26 2017

STATUS

approved

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Last modified May 13 16:56 EDT 2021. Contains 343862 sequences. (Running on oeis4.)