A077241 - OEIS

This site is supported by donations to The OEIS Foundation.

A077241

Combined Diophantine Chebyshev sequences A054488 and A077413.

1, 2, 8, 13, 47, 76, 274, 443, 1597, 2582, 9308, 15049, 54251, 87712, 316198, 511223, 1842937, 2979626, 10741424, 17366533, 62605607, 101219572, 364892218, 589950899, 2126747701, 3438485822, 12395593988 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`-8*a(n)^2 + b(n)^2 = 17, with the companion sequence b(n)= A077242(n).`
	LINKS	`Index entries for sequences related to Chebyshev polynomials.`
	FORMULA	`a(2k)= A054488(k) and a(2k+1)= A077413(k), k>=0.` `G.f.: (1+x)(1+x+x^2)/(1-6x^2+x^4).`
	EXAMPLE	`8a(2)^2 + 17 = 88^2+17 = 529 = 23^2 = A077242(2)^2.`
	CROSSREFS	`Sequence in context: A037382 A095825 A106359 * A066567 A002248 A194278` `Adjacent sequences: A077238 A077239 A077240 * A077242 A077243 A077244`
	KEYWORD	`nonn,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Nov 08 2002`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 05:45 EST 2012. Contains 205694 sequences.