A233819 Least odd integer of each prime signature ordered by prime signatures occurrence.

1, 3, 9, 15, 27, 45, 81, 135, 105, 243, 225, 405, 315, 729, 675, 1215, 945, 2187, 2025, 1575, 3645, 1155, 3375, 2835, 6561, 6075, 4725, 10935, 3465, 10125, 8505, 19683, 18225, 14175, 32805, 10395, 30375, 11025, 25515, 59049, 23625, 54675, 17325, 50625, 42525, 98415, 31185, 91125, 33075, 76545, 177147, 70875

Offset: 1

Author

Lior Manor, Dec 16 2013

Keywords

• nonn

Comments

a(n) is the least odd integer with the same prime signature as A025487(n).

Examples

			a(7) is the first odd integer with prime signature {1,3} = 3^3*5 = 135.
a(8) is the first odd integer with prime signature {1,1,1} = 3*5*7 = 105.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• Will Nicholes, Prime Signatures

Crossrefs

Cf. A003961, A025487, A147516.

Formula

a(n) = A003961(A025487(n)). - Amiram Eldar, Jun 23 2019