A225515 First differences of A121347.

2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2

Offset: 1

Author

Zak Seidov, May 09 2013

Keywords

• nonn

Comments

Apparently a(n) = 1 or 2. From first 10000 terms, 8597 terms = 2.

Links

• Zak Seidov, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A121347.

Programs

Mathematica

s={2}; f1=4; f2=2; k=2; Do[f1=f1*n^2; While[f2
				

Formula

a(n) = A121347(n+2) - A121347(n+1).