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

1,1

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

Formula

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

Mathematica

s={2}; f1=4; f2=2; k=2; Do[f1=f1*n^2; While[f2<f1, k++; f2=f2*k]; AppendTo[s, k-1], {n, 3, 100}]; Rest[s]-Most[s]

Crossrefs

Cf. A121347.

Sequence in context: A022303 A113189 A143098 * A265404 A274353 A183028

Adjacent sequences: A225512 A225513 A225514 * A225516 A225517 A225518

Keyword

nonn

Author

Zak Seidov, May 09 2013

Status

approved