A240543 Number of n-digit positive integers with maximum number of divisors A066150(n).

2, 5, 1, 2, 2, 5, 1, 6, 4, 5, 1, 1, 2, 1, 2, 3, 7, 2

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

a(1) = 2, since two 1-digit numbers have the maximum number of divisors 4 = #{1, 2, 3, 6} = #{1, 2, 4, 8}.
a(2) = 5, since five 2-digit numbers have the maximum number of divisors 12 = #{1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60} = #{1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72} = #{1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84} = #{1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90} = #{1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96}.

Crossrefs

Cf. A066151, A069650, A240544.

Sequence in context: A091772 A275479 A075790 * A004575 A021402 A201890

Adjacent sequences: A240540 A240541 A240542 * A240544 A240545 A240546

Keyword

nonn,base,more

Author

Martin Renner, Apr 07 2014

Extensions

a(10)-a(12) from Giovanni Resta, Apr 08 2014

a(13)-a(18) from Kevin P. Thompson, Sep 04 2022

Status

approved