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

Author

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

Keywords

• easy
• fini
• full
• nonn
• tabf

Comments

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

Examples

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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.