OFFSET
1,2
COMMENTS
Apparently, the distinct values of a(n)-n for n > 7 correspond to A190894. - Rémy Sigrist, Jul 23 2019
MATHEMATICA
a[1] = 1; a[2] = 2; a[n_] := a[n] = a[n-1] + GCD[a[n-2], n-2]; Array[a, 70] (* Amiram Eldar, Aug 01 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Thomas Kerscher, May 29 2019
STATUS
approved