id:A132835 - OEIS Search Results

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Largest terms a(n) forming a self-convolution cube of an integer sequence (A132836) such that: a(n) <= 3*a(n-1) for n>0 with a(0)=1.

+0
5

1, 3, 9, 25, 75, 225, 674, 2022, 6066, 18196, 54588, 163764, 491291, 1473873, 4421619, 13264856, 39794568, 119383704, 358151111, 1074453333, 3223359999, 9670079995, 29010239985, 87030719955, 261092159865, 783276479595 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) {a(n)=local(B=[1], R); if(n==0, 1, for(k=1, n, t=3a(k-1); B=concat(B, t); R=Vec(Ser(B)^(1/3))[ #B]; B[ #B]=t-(numerator(R)%3)(denominator(R)-1)/2 )); B[n+1]}`
	CROSSREFS	`Cf. A132836 (cube-root); A132831 (variant).` `Sequence in context: A079857 A101499 A004665 this_sequence A001189 A101786 A012771` `Adjacent sequences: A132832 A132833 A132834 this_sequence A132836 A132837 A132838`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Sep 07 2007`

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

AT&T Labs Research