A185126 A spider's web: Chronological order of 27 rays in a triangle.

1, 13, 20, 24, 16, 7, 26, 14, 3, 9, 22, 18, 5, 11, 21, 15, 2, 12, 27, 23, 10, 4, 19, 6, 17, 8, 25

Offset

1,2

Comments

A permutation of the first 27 natural numbers.

The first side is created just after the third ray (numbered 20). It is named I (from the third to the first ray).

The second side is created just after the fourth ray (numbered 24). It is named II (from the third to the second ray (numbered 13)).

The third side is created just after the fifth ray (numbered 16). It is named III (from the second to the first ray (numbered 1)).

Chronological distribution:

I 4 7 11 15 19 20 27

II 5 8 12 16 23 25

III 6 9 10 13 14 17 18 21 22 24 26

Final distribution:

1,17,9,22,13,24,6,26,10,21,14,18,2,8,16,5,25,12,23,3,15,11,20,4,27,7,19.

Links

Table of n, a(n) for n=1..27.

Espace-sciences, A virtual spider making its web

Crossrefs

Sequence in context: A176150 A095040 A069195 * A366959 A098956 A302390

Adjacent sequences: A185123 A185124 A185125 * A185127 A185128 A185129

Keyword

nonn,fini,full

Author

Paul Curtz, Jan 20 2012

Status

approved