A374796 Positive integers that can be written as a Stirling number of the second kind in more than one way.

1, 15, 4095, 66066

Offset: 1

Author

Pontus von Brömssen, Jul 20 2024

Keywords

• nonn
• more

Comments

k*(k+1)/2 is a term if k is a term of A215797 and k != 0,2.

a(5) > 10^8 (if it exists).

Examples

			With S2(n,k) = A008277(n,k):
      1 = S2( 1, 1) = S2(  2,  1) (for example);
     15 = S2( 5, 2) = S2(  6,  5);
   4095 = S2(13, 2) = S2( 91, 90);
  66066 = S2(14,11) = S2(364,363).
		

Crossrefs

Cf. A008277, A024412, A215797.