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A376739

Main diagonal of A376738: a(n) is the n-th number which is the product of n (possibly non-distinct) primes having the same number of decimal digits.

2, 6, 18, 40, 108, 224, 480, 1296, 2688, 5760, 12800, 31104, 64512, 138240, 286720, 614400, 1492992, 3096576, 6422528

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OFFSET

1,1

COMMENTS

See A376738 for more information.

First differs from A101695 at n = 10.

LINKS

Table of n, a(n) for n=1..19.

FORMULA

a(n) = A376738(n,n).

MATHEMATICA

A376739[n_] := Module[{m = 2^n - 1}, Do[While[Total[(f = FactorInteger[++m])[[All, 2]]] != n || Length[Union[IntegerLength[f[[All, 1]]]]] > 1], n]; m];

Array[A376739, 15]

CROSSREFS

Cf. A101695, A376738.

Sequence in context: A338765 A339149 A101695 * A364672 A014741 A016059

Adjacent sequences: A376736 A376737 A376738 * A376740 A376741 A376742

KEYWORD

nonn,base,more

AUTHOR

Paolo Xausa, Oct 03 2024

STATUS

approved

URL: https://oeis.org/A376739

⇱ A376739 - OEIS