A138723 Atomic numbers of the periodic table of the elements, read downwards along 18 columns, up to the 5th period.

1, 3, 11, 19, 37, 4, 12, 20, 38, 21, 39, 22, 40, 23, 41, 24, 42, 25, 43, 26, 44, 27, 45, 28, 46, 29, 47, 30, 48, 5, 13, 31, 49, 6, 14, 32, 50, 7, 15, 33, 51, 8, 16, 34, 52, 9, 17, 35, 53, 2, 10, 18, 36, 54

Offset

1,2

Comments

This finite sequence has 54 members. Atomic numbers > 54 are not members.

Links

Table of n, a(n) for n=1..54.

Example

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........... THE PERIODIC TABLE OF THE ELEMENTS ............
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P/G: 1A 2A 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B 3A 4A 5A 6A 7A 8A
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(1): .1 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .2
(2): .3 .4 .. .. .. .. .. .. .. .. .. .. .5 .6 .7 .8 .9 10
(3): 11 12 .. .. .. .. .. .. .. .. .. .. 13 14 15 16 17 18
(4): 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
(5): 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
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Crossrefs

Cf. A099955, A134984, A138724, A138725, A138726, A138727.

Sequence in context: A270528 A213540 A085616 * A099955 A138724 A134984

Adjacent sequences: A138720 A138721 A138722 * A138724 A138725 A138726

Keyword

easy,fini,full,nonn,tabf

Author

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

Status

approved