A101272 a(n)=n, n <=6; a(n)=6, n > 6.

1, 2, 3, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6

Offset

1,2

Comments

Sequence of electron arrangements in the 2p, 3p, 4p and 5p atomic subshells.

References

A. Beiser, Concepts of Modern Physics, 2nd Ed., McGraw-Hill, 1973.

R. M. Tennent (Editor), Science Data Book, Oliver & Boyd, 1971.

Links

Table of n, a(n) for n=1..105.

Index entries for linear recurrences with constant coefficients, signature (1).

Formula

a(n)=n, n <=6; a(n)=6, n > 6.

Euler transform of length 6 sequence [ 2, 0, 0, 0, 0, -1]. - Michael Somos, Aug 31 2006

G.f.: (1-x^6)/(1-x)^2. - Michael Somos, Aug 31 2006

a(n) = min(n,6). - Wesley Ivan Hurt, Apr 16 2014

Example

a(6)=6.

Mathematica

Table[Min[n, 6], {n, 120}] (* Harvey P. Dale, Mar 09 2014 *)

Prog

(PARI) a(n)=min(6, n) /* Michael Somos, Aug 31 2006, edited by M. F. Hasler, Apr 16 2014 */

Crossrefs

Cf. A040000.

Sequence in context: A293705 A036055 A034151 * A006160 A071640 A102674

Adjacent sequences: A101269 A101270 A101271 * A101273 A101274 A101275

Keyword

easy,nonn

Author

Jeremy Gardiner, Dec 19 2004

Status

approved