id:A080530 - OEIS Search Results

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Number of nucleons in longest known radioactive decay series ending with Lead 207 ("actinium series"), reversed.

+0
6

207, 207, 211, 211, 215, 215, 219, 223, 227, 227, 231, 235, 239, 243, 247, 251, 255, 259, 263, 267, 271 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`The numbers are all equivalent to 3 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	`C. Heilman, The Pictorial Periodic Table`
	FORMULA	`a(n)=A080534(n)+A080538(n).`
	CROSSREFS	`Cf. A080529, A080531, A080532.` `Sequence in context: A113490 A054007 A133149 this_sequence A045069 A052093 A103477` `Adjacent sequences: A080527 A080528 A080529 this_sequence A080531 A080532 A080533`
	KEYWORD	`nonn,hard`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Feb 20 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.