A013581 - OEIS

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A013581

Let P = 2*3*5*..*p_n = n-th primorial number (A002110), G = Z_2xZ_3x...xZ_{p_n}; a(n) = max{e in G} min{i : both e+i, e-i are relatively prime to P}.

1, 3, 9, 15, 33, 75, 90, 105, 165, 213 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A048701 A031159 A058039 * A133997 A057909 A082702` `Adjacent sequences: A013578 A013579 A013580 * A013582 A013583 A013584`
	KEYWORD	`nonn`
	AUTHOR	`Paw Hermansen (paw(AT)imada.ou.dk)`
	EXTENSIONS	`I added the two terms a(9)=165 and a(10)=213, which were found by a computer program that searched through all numbers. Michael Hovdan (michael.hovdan(AT)gmail.com), Aug 31 2009`

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.