OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Amiram Eldar, Plot of a(n)/n for n = 20000..650000
FORMULA
Conjecture : a(n) is asymptotic to c*n where c is around 3.8...
MATHEMATICA
max = 1500; s = Union @ Flatten[NestWhileList[Flatten[{2*# + 1, 3*# + 1}] &, 1, Min[#1] < max &]]; 1 + Position[Differences[Select[s, # <= max &]], 1] // Flatten (* Amiram Eldar, May 07 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Nov 20 2002
STATUS
approved