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A191304
Records in A132199.
3
1, 5, 11, 23, 47, 101, 233, 467, 941, 1889, 3779, 7559, 15131, 30323, 60647, 121403, 242807, 486041, 972533, 1945649, 3891467, 7783541, 15567089, 31139561, 62279171, 124559609, 249120239, 498270791, 996541661, 1993083437, 3986167223, 7972334723, 15944673761
OFFSET
1,2
COMMENTS
Except for a(1)=1, log(a(n)) is nearly but not exactly linear. - Ralf Steiner, Aug 18 2017
LINKS
FORMULA
For all a(n) except a(1)=1 is 5 congruent mod 6, a(n+1) > 2 a(n) and lim_{n->inf} a(n+1)/a(n) = 2. - Ralf Steiner, Aug 18 2017
MATHEMATICA
Union@ FoldList[Max, Rest@ # - Most@ #] &@ FoldList[#1 + GCD[#2, #1] &, 7, Range[2, 10^7]] (* Michael De Vlieger, Aug 19 2017, after Robert G. Wilson v at A132199 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Apr 30 2009
EXTENSIONS
a(23)-a(33) from Ralf Steiner, Aug 18 2017
STATUS
approved