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

1,1

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

Table of n, a(n) for n=1..81.

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

Formula

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

Crossrefs

Cf. A172468, A167389.

Sequence in context: A181161 A152580 A197722 * A120665 A163941 A289418

Adjacent sequences: A172467 A172468 A172469 * A172471 A172472 A172473

Keyword

nonn

Author

Stephen Crowley, Feb 04 2010

Status

approved