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

1,2

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).

Links

Table of n, a(n) for n=1..4.

Example

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.

Sequence in context: A153832 A198524 A208463 * A374335 A172322 A139297

Adjacent sequences: A374793 A374794 A374795 * A374797 A374798 A374799

Keyword

nonn,more

Author

Pontus von Brömssen, Jul 20 2024

Status

approved