A080529 - OEIS

A080529

Number of nucleons in longest known radioactive decay series ending with Lead 206 ("uranium series"), reversed.

206, 206, 206, 210, 210, 214, 214, 218, 222, 226, 230, 234, 238, 242, 242, 246, 250, 254, 258, 262, 266

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OFFSET

0,1

COMMENTS

The numbers are all equivalent to 2 mod 4. The sequence was submitted reversed, as it is open in the past. It is unknown if reversed decay series are finite (the "island of stability" hypothesis).

LINKS

Table of n, a(n) for n=0..20.

C. Heilman, The Pictorial Periodic Table

FORMULA

a(n)=A080533(n)+A080537(n).

CROSSREFS

Cf. A080530, A080531, A080532.

Sequence in context: A188447 A252278 A252271 * A261749 A058180 A025351

Adjacent sequences: A080526 A080527 A080528 * A080530 A080531 A080532

KEYWORD

nonn,hard

AUTHOR

Ralf Stephan, Feb 20 2003

STATUS

approved