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Search: id:A132837
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| A132837 |
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Largest terms a(n) forming a self-convolution 4-th power of an integer sequence (A132838) such that: a(n) <= 4*a(n-1) for n>0 with a(0)=1. |
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+0
4
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| 1, 4, 14, 56, 221, 884, 3534, 14136, 56542, 226168, 904672, 3618688, 14474751, 57899004, 231596014, 926384056, 3705536222, 14822144888, 59288579552, 237154318208, 948617272832, 3794469091328, 15177876365312, 60711505461248
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) {a(n)=local(A, t, r=1); A=if(n==0, [1], vector(n, j, a(j-1))); if(n==0, r=1, t=a(n-1); if(denominator(Vec(Ser(concat(A, 4*t))^(1/4))[n+1])==1, r=4*t, if(denominator(Vec(Ser(concat(A, 4*t-1))^(1/4))[n+1])==1, r=4*t-1, if(denominator(Vec(Ser(concat(A, 4*t-2))^(1/4))[n+1])==1, r=4*t-2, r=4*t-3)))); r}
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CROSSREFS
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Cf. A132838 (fourth-root); variants: A132831, A132835, A132839.
Sequence in context: A088655 A149490 A143406 this_sequence A149491 A073155 A006212
Adjacent sequences: A132834 A132835 A132836 this_sequence A132838 A132839 A132840
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Sep 10 2007
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