A172470 First differences of A172468.

9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9

Offset: 1

Author

Stephen Crowley, Feb 04 2010

Keywords

• nonn

Comments

The numbers in the sequence are conjectured to be restricted to 9,52, or 61. Note that 61-52 = 9, (52+2)/(61-52) = (52+2)/9 = 6, (61+2)/(61-52) = (61+2)/9 = 7 and we have lcm(9,52,61) =28548 = 13^4 - 13 and (52+2)/9 + (61+2)/9 = 6+7 = 13.

Links

• Stephen Crowley, A Mysterious Three Term Integer Sequence Related to a Lambert W Function Solution to a Certain Transcendental Equation

Crossrefs

Cf. A172468, A167389.

Formula

a(n) = A172468(n+1) - A172468(n).