login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A020751
Pisot sequence T(6,9), a(n) = floor(a(n-1)^2/a(n-2)).
1
6, 9, 13, 18, 24, 32, 42, 55, 72, 94, 122, 158, 204, 263, 339, 436, 560, 719, 923, 1184, 1518, 1946, 2494, 3196, 4095, 5246, 6720, 8608, 11026, 14123, 18089, 23168, 29673, 38004, 48674, 62339, 79840, 102254, 130960, 167724, 214808, 275109, 352337, 451244, 577915
OFFSET
0,1
LINKS
PROG
(PARI) pisotT(nmax, a1, a2) = {
a=vector(nmax); a[1]=a1; a[2]=a2;
for(n=3, nmax, a[n] = floor(a[n-1]^2/a[n-2]));
a
}
pisotT(50, 6, 9) \\ Colin Barker, Jul 29 2016
CROSSREFS
Subsequence of A020747. See A008776 for definitions of Pisot sequences.
Sequence in context: A315964 A315965 A167614 * A315966 A315967 A315968
KEYWORD
nonn
STATUS
approved