cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A138040 Atomic number of the 2nd transition metal (group 4) in the n-th row of the periodic system of elements.

Original entry on oeis.org

22, 40, 72, 104
Offset: 4

Views

Author

Paul Curtz, May 02 2008

Keywords

Comments

Refers to Titanium=22, Zirconium=40, Hafnium=72, Rutherfordium=104.

Links

Crossrefs

Cf. A134984, A138724, A137575.

Extensions

Edited by R. J. Mathar, May 21 2009

A137937 A137904(n) - A137575(n).

Original entry on oeis.org

0, 0, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86
Offset: 0

Views

Author

Paul Curtz, Apr 30 2008

Keywords

Comments

To have 0 upon vertical 2, 10, 18, 36, 54, 86 (noble gases) is not a problem (with the help of A137583. A (second) 0 upon 1, 3, 11, 19, 37, 55, 87 (alkali metals), seems paradoxal. Is 120 terms (elements) sequence 0, 0, 1, 2, .. 117, 118 credible? This leads to a row 0 (0 upon hydrogen, 0 upon helium). Two common points with Janet periodic table elements.
60 terms: another, with A137913, theoritical companion to A137904.

Crossrefs

Cf. A134984, A137575, A137904.

Formula

A137913 prepended with 0, 0.

A138052 Atomic number of the penultimate transition metal (group 11) in the n-th row of the periodic system of elements.

Original entry on oeis.org

29, 47, 79, 111
Offset: 4

Views

Author

Paul Curtz, May 02 2008

Keywords

Comments

This refers to Cu=29, Ar=47, Au=79, and Rg=111.
The first differences are 18, 18, 32, indicating that there is a row of Lanthanides between Au and Rg.

Links

Crossrefs

Cf. A134984, A138724, A137575, A137846, A138040.

Extensions

Edited by R. J. Mathar, May 21 2009
Previous Showing 11-13 of 13 results.

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