A163821 - OEIS

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A163821

a(n) = product of decimal digits of A000043(n).

2, 3, 5, 7, 3, 7, 9, 3, 6, 72, 0, 14, 10, 0, 126, 0, 32, 42, 120, 96, 3888, 324, 6, 1701, 0, 0, 4032, 1152, 0, 0, 0, 45360, 12960, 27440, 23328, 3024, 0, 102060, 27216, 0, 0, 97200, 0, 100800, 158760, 0, 0, 67200

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..48.

FORMULA

a(n) = A007954(A000043(n)). - Amiram Eldar, Oct 16 2024

MATHEMATICA

a[n_] := Times @@ IntegerDigits[MersennePrimeExponent[n]]; Array[a, 48] (* Amiram Eldar, Oct 16 2024 *)

CROSSREFS

Cf. A000043, A007954.

Sequence in context: A073034 A239037 A126050 * A156294 A126607 A124322

Adjacent sequences: A163818 A163819 A163820 * A163822 A163823 A163824

KEYWORD

base,nonn,more,changed

AUTHOR

Boris Hostnik (megpplus(AT)siol.net), Aug 04 2009

EXTENSIONS

a(38)-a(39) corrected and a(40)-a(48) added by Amiram Eldar, Oct 16 2024

STATUS

approved