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A324910 Multiplicative with a(p^e) = (2^e)-1. 2
1, 1, 1, 3, 1, 1, 1, 7, 3, 1, 1, 3, 1, 1, 1, 15, 1, 3, 1, 3, 1, 1, 1, 7, 3, 1, 7, 3, 1, 1, 1, 31, 1, 1, 1, 9, 1, 1, 1, 7, 1, 1, 1, 3, 3, 1, 1, 15, 3, 3, 1, 3, 1, 7, 1, 7, 1, 1, 1, 3, 1, 1, 3, 63, 1, 1, 1, 3, 1, 1, 1, 21, 1, 1, 3, 3, 1, 1, 1, 15, 15, 1, 1, 3, 1, 1, 1, 7, 1, 3, 1, 3, 1, 1, 1, 31, 1, 3, 3, 9, 1, 1, 1, 7, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

Index entries for sequences computed from exponents in factorization of n

FORMULA

Multiplicative with a(p^e) = A000225(e).

Multiplicative with a(p^e) = A322993(p^e).

a(n) = A246674(A156552(n)).

MATHEMATICA

Array[Times @@ (2^(FactorInteger[#][[All, -1]]) - 1) &, 105] (* Michael De Vlieger, Apr 14 2019 *)

PROG

(PARI) A324910(n) = factorback(apply(e -> -1+(2^e), factor(n)[, 2]~));

CROSSREFS

Cf. A000225, A156552, A246674, A322993, A324911.

Sequence in context: A276651 A185587 A068845 * A257100 A152884 A263756

Adjacent sequences:  A324907 A324908 A324909 * A324911 A324912 A324913

KEYWORD

nonn,mult

AUTHOR

Antti Karttunen, Apr 14 2019

STATUS

approved

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Last modified October 14 09:57 EDT 2019. Contains 327995 sequences. (Running on oeis4.)