A346216 a(n) = (10^n)-th Ulam number A002858.

1, 18, 690, 12294, 132788, 1351223, 13509072, 135160791, 1351856726, 13517664323

Offset: 0

Author

Frank M Jackson, Oct 16 2021

Keywords

• nonn
• more

Comments

The terms a(0)-a(4) are from the b-file for A002858. The remaining terms are from the paper by Philip Gibbs. As the sequence settles, its terms lie very close to the straight line 13.51*n.

Links

• Philip Gibbs, An Efficient Method for Computing Ulam Numbers, viXra:1508.0085 (2015).
• Wikipedia, Ulam number.

Crossrefs

Cf. A002858.

Formula

a(n) = A002858(10^n).

Extensions

a(5)-a(9) from Philip Gibbs and Jud McCranie, Feb 29 2012 - Sep 09 2015