OFFSET
1,3
LINKS
R. W. Grosse-Kunstleve, Penny Spiral Sequence
FORMULA
The n-th "chunk" consists of 2 3{n-2} 2 3{n-1} 2 3{n-1} 2 3{n-1} 2 3{n-1} 2 3{n}, where a{b} symbolizes b repetitions of a.
EXAMPLE
From Omar E. Pol, Nov 16 2016: (Start)
The sequence written as a spiral begins:
.
. 2 - 3 - 3 - 3 - 3 - 2
. / \
. 3 2 - 3 - 3 - 3 - 2 3
. / / \ \
. 3 3 2 - 3 - 3 - 2 3 3
. / / / \ \ \
. 3 3 3 2 - 3 - 2 3 3 3
. / / / / \ \ \ \
. 3 3 3 3 2 - 2 3 3 3 3
. / / / / / \ \ \ \ \
. 2 2 2 2 2 0 - 1 2 2 2 2
. \ \ \ \ \ / / / /
. 3 3 3 3 2 - 3 - 2 3 3 3
. \ \ \ \ / / /
. 3 3 3 2 - 3 - 3 - 2 3 3
. \ \ \ / /
. 3 3 2 - 3 - 3 - 3 - 2 3
. \ \ /
. 3 2 - 3 - 3 - 3 - 3 - 2
. \
. 2 - 3 - 3 - 3 - 3 - 3
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved