id:A130334 - OEIS Search Results

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Smallest m>n such that the m-th and n-th triangular numbers are coprime.

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5

2, 4, 10, 6, 7, 10, 9, 10, 13, 12, 13, 22, 15, 16, 22, 18, 19, 22, 21, 22, 25, 24, 25, 37, 27, 28, 37, 30, 31, 37, 33, 34, 37, 36, 37, 46, 39, 40, 46, 42, 43, 46, 45, 46, 52, 48, 49, 58, 51, 52, 58, 54, 55, 58, 57, 58, 61, 60, 61, 73, 63, 64, 73, 66, 67, 70, 69, 70, 73, 72, 73 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) > n+1 for n>1; a(n) > n+2 for n with n mod 3 = 0;` `a(n) = n + A130335(n).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000` `Eric Weisstein's World of Mathematics, Triangular Number` `Eric Weisstein's World of Mathematics, Relatively Prime`
	CROSSREFS	`Cf. A000217, A026741, A109007.` `Sequence in context: A128942 A135445 A098556 this_sequence A124108 A097211 A092945` `Adjacent sequences: A130331 A130332 A130333 this_sequence A130335 A130336 A130337`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 28 2007`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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