cp's OEIS Frontend

A138724 Atomic numbers of the periodic table of the elements, read downwards along 18 columns, up to the 7th period.

%I A138724 #3 Mar 30 2012 17:33:54
%S A138724 1,3,11,19,37,55,87,4,12,20,38,56,88,21,39,57,89,22,40,72,104,23,41,
%T A138724 73,105,24,42,74,106,25,43,75,107,26,44,76,108,27,45,77,109,28,46,78,
%U A138724 110,29,47,79,111,30,48,80,112,5,13,31,49,81,113
%N A138724 Atomic numbers of the periodic table of the elements, read downwards along 18 columns, up to the 7th period.
%C A138724 This finite sequence has 90 members. Atomic numbers of the elements of Lanthanide series (58 to 71) and Actinide series (90 to 103) and atomic numbers > 118 are not members.
%e A138724 =====================================================================
%e A138724 ................. THE PERIODIC TABLE OF THE ELEMENTS ................
%e A138724 =====================================================================
%e A138724 1A 2A 3B .4B .5B .6B .7B .8B .8B .8B .1B .2B .3A .4A .5A .6A .7A .8A
%e A138724 =====================================================================
%e A138724 1. .. .. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ..2
%e A138724 3. 4. .. ... ... ... ... ... ... ... ... ... ..5 ..6 ..7 ..8 ..9 .10
%e A138724 11 12 .. ... ... ... ... ... ... ... ... ... .13 .14 .15 .16 .17 .18
%e A138724 19 20 21 .22 .23 .24 .25 .26 .27 .28 .29 .30 .31 .32 .33 .34 .35 .36
%e A138724 37 38 39 .40 .41 .42 .43 .44 .45 .46 .47 .48 .49 .50 .51 .52 .53 .54
%e A138724 55 56 57 .72 .73 .74 .75 .76 .77 .78 .79 .80 .81 .82 .83 .84 .85 .86
%e A138724 87 88 89 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
%e A138724 =====================================================================
%Y A138724 Cf. A099955, A134984, A138723, A138725, A138726, A138727.
%K A138724 easy,fini,nonn,tabf
%O A138724 1,2
%A A138724 _Omar E. Pol_, Mar 26 2008, Jan 25 2009