OFFSET
0,2
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.
FORMULA
a(n) = A002858(10^n).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Frank M Jackson, Oct 16 2021
EXTENSIONS
a(5)-a(9) from Philip Gibbs and Jud McCranie, Feb 29 2012 - Sep 09 2015
STATUS
approved