id:A118234 - OEIS Search Results

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Column 3 of triangle A118233, starting at row 1 to include leading zeros.

+0
1

0, 0, 1, 2, 0, 3, 2, 2, 3, 6, 1, 7, 3, 3, 5, 10, 2, 11, 5, 5, 7, 14, 3, 13, 7, 8, 7, 18, 3, 19, 10, 9, 11, 15, 5, 23, 11, 11, 11, 26, 5, 27, 13, 11, 15, 30, 7, 27, 13, 15, 15, 34, 8, 27, 15, 17, 19, 38, 7, 39, 19, 17, 21, 31, 9, 43, 21, 21, 15, 46, 11, 47, 23, 19, 23, 39, 11, 51, 21, 26, 27 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`a(3n-1) = eulerphi(3n)/2 - 1.`
	PROGRAM	`(PARI) {a(n)=local(M=matrix(n+2, n+2, r, c, if(r>=c, if(gcd(r-c+1, c)==1, 1, 0)))^2); M[n, 3]}`
	CROSSREFS	`Cf. A118233.` `Sequence in context: A082785 A100949 A110493 this_sequence A132623 A051613 A077961` `Adjacent sequences: A118231 A118232 A118233 this_sequence A118235 A118236 A118237`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet (qq-quet(AT)mindspring.com), Paul D. Hanna (pauldhanna(AT)juno.com), Apr 16 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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