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A080538 Number of neutrons in longest known radioactive decay series ending with Lead 207 ("actinium series"), reversed. 5
125, 126, 128, 129, 131, 132, 134, 136, 138, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

See comments in A080530, protons are in A080534.

LINKS

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

C. Heilman, The Pictorial Periodic Table

FORMULA

a(n)=A080530(n)-A080534(n).

CROSSREFS

Cf. A080537, A080539, A080540.

Sequence in context: A030678 A028939 A195420 * A104233 A046759 A115938

Adjacent sequences:  A080535 A080536 A080537 * A080539 A080540 A080541

KEYWORD

nonn,hard

AUTHOR

Ralf Stephan, Feb 20 2003

STATUS

approved

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Last modified November 27 07:28 EST 2021. Contains 349365 sequences. (Running on oeis4.)