A181807 Number of divisors of A181806(n) that are highly composite (A002182).

1, 2, 3, 5, 6, 7, 8, 10, 11, 14, 19, 20, 21, 22, 23, 24, 25, 28, 31, 32, 33, 35, 38, 39, 41, 48, 49, 52, 53, 57, 59, 65, 67, 69, 77, 81, 82, 86, 91, 94, 103, 105, 107, 114, 118, 122, 125, 131, 132, 135, 141, 142, 144, 145, 154, 157, 160, 163, 166, 171, 175, 180

Offset: 1

Author

Matthew Vandermast, Nov 27 2010

Keywords

• nonn

Comments

Also, length of row A181806(n) in triangles A181802 and A181803.

Examples

			A181806(4) = 12 has exactly five divisors (namely, 1, 2, 4, 6 and 12) that are members of A002182.  Hence, a(4) = 5.
		

Links

• David A. Corneth, Table of n, a(n) for n = 1..153
• A. Flammenkamp, List of the first 1200 highly composite numbers
• Eric Weisstein's World of Mathematics, Highly composite number

Crossrefs

Cf. A002182, A181801, A181802, A181803, A181806.

Formula

a(n) = A181801(A181806(n)).

Extensions

More terms from Amiram Eldar, Aug 29 2019 (calculated from the b-file at A181806)