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 A285703 a(n) = A000203(A064216(n)). 4
 1, 3, 4, 6, 7, 8, 12, 12, 14, 18, 18, 20, 13, 15, 24, 30, 24, 24, 32, 36, 38, 42, 28, 44, 31, 42, 48, 32, 54, 54, 60, 42, 48, 62, 60, 68, 72, 39, 48, 74, 31, 80, 56, 72, 84, 72, 90, 72, 90, 56, 98, 102, 72, 104, 108, 96, 110, 80, 84, 84, 57, 114, 40, 114, 126, 128, 108, 60, 132, 138, 132, 96, 96, 93, 140, 150, 98, 120, 152, 144, 120, 158, 96, 164, 133, 126 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A000203(A064216(n)). MATHEMATICA Table[DivisorSigma[1, #] &@ If[n == 1, 1, Apply[Times, FactorInteger[2 n - 1] /. {p_, e_} /; p > 2 :> NextPrime[p, -1]^e]], {n, 86}] (* Michael De Vlieger, Apr 26 2017 *) PROG (Scheme) (define (A285703 n) (A000203 (A064216 n))) CROSSREFS Cf. A000203, A064216, A099774, A285702, A285704, A285705. Sequence in context: A047515 A066650 A007609 * A002191 A108348 A085149 Adjacent sequences:  A285700 A285701 A285702 * A285704 A285705 A285706 KEYWORD nonn AUTHOR Antti Karttunen, Apr 26 2017 STATUS approved

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Last modified March 20 21:49 EDT 2019. Contains 321352 sequences. (Running on oeis4.)