A138725 Atomic numbers in the periodic table of the elements, read downwards along 50 columns, up to the 9th period.

1, 3, 11, 19, 37, 55, 87, 119, 169, 4, 12, 20, 38, 56, 88, 120, 170, 21, 39, 57, 89, 121, 171, 58, 90, 122, 172, 123, 173, 124, 174, 125, 175, 126, 176, 127, 177, 128, 178, 129, 179, 130, 180, 131, 181, 132, 182, 133, 183, 134, 184

Offset

1,2

Comments

This finite sequence has 218 members. Atomic numbers > 218 are not members.

This sequence assumes simple extrapolation rather than recent research. - J. Lowell, Jan 26 2021

Links

Table of n, a(n) for n=1..51.

Example

======================================================
................... STRUCTURE OF ....................
........ THE PERIODIC TABLE OF THE ELEMENTS .........
................... (50 columns) ....................
======================================================
1) X................................................X
2) XX..........................................XXXXXX
3) XX..........................................XXXXXX
4) XXX................................XXXXXXXXXXXXXXX
5) XXX................................XXXXXXXXXXXXXXX
6) XXXX..................XXXXXXXXXXXXXXXXXXXXXXXXXXXX
7) XXXX..................XXXXXXXXXXXXXXXXXXXXXXXXXXXX
8) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
9) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
======================================================

Crossrefs

Cf. A099955, A134984, A138723, A138724, A138726, A138727.

Sequence in context: A099955 A138724 A134984 * A138726 A219527 A161429

Adjacent sequences: A138722 A138723 A138724 * A138726 A138727 A138728

Keyword

fini,nonn,tabf

Author

Omar E. Pol, Mar 26 2008, Jan 25 2009

Status

approved