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Atomic numbers in the periodic table of the elements, read downwards along 50 columns, up to the 9th period.
4

%I #12 Feb 03 2021 23:12:40

%S 1,3,11,19,37,55,87,119,169,4,12,20,38,56,88,120,170,21,39,57,89,121,

%T 171,58,90,122,172,123,173,124,174,125,175,126,176,127,177,128,178,

%U 129,179,130,180,131,181,132,182,133,183,134,184

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

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

%C This sequence assumes simple extrapolation rather than recent research. - _J. Lowell_, Jan 26 2021

%e ======================================================

%e ................... STRUCTURE OF ....................

%e ........ THE PERIODIC TABLE OF THE ELEMENTS .........

%e ................... (50 columns) ....................

%e ======================================================

%e 1) X................................................X

%e 2) XX..........................................XXXXXX

%e 3) XX..........................................XXXXXX

%e 4) XXX................................XXXXXXXXXXXXXXX

%e 5) XXX................................XXXXXXXXXXXXXXX

%e 6) XXXX..................XXXXXXXXXXXXXXXXXXXXXXXXXXXX

%e 7) XXXX..................XXXXXXXXXXXXXXXXXXXXXXXXXXXX

%e 8) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

%e 9) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

%e ======================================================

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

%K fini,nonn,tabf

%O 1,2

%A _Omar E. Pol_, Mar 26 2008, Jan 25 2009