id:A080531 - OEIS Search Results

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Number of nucleons in longest known radioactive decay series ending with Lead 208 ("thorium series"), reversed.

+0
6

208, 208, 212, 212, 216, 220, 224, 224, 228, 228, 232, 236, 240, 244, 248, 252, 252, 256, 260, 264, 268, 272 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`The numbers are all equivalent to 0 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)=A080535(n)+A080539(n).`
	CROSSREFS	`Cf. A080529, A080530, A080532.` `Sequence in context: A045069 A052093 A103477 this_sequence A123136 A092153 A131686` `Adjacent sequences: A080528 A080529 A080530 this_sequence A080532 A080533 A080534`
	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.