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 A221132 a(n) = lcm(a(n-1), n^2 + n + 1) for n > 1 with a(1) = 1. 0
 1, 7, 91, 273, 8463, 363909, 6914271, 504741783, 504741783, 18675445971, 18675445971, 2932045017447, 178854746064267, 37738351419560337, 9094942692114041217, 9094942692114041217, 2792147406479010653619, 136815222917471522027331 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Not the same as if a(n) = lcm(f(1),f(2),...,f(n))/3 with f(x)=x^2+x+1 and a(1)=f(1). LINKS Table of n, a(n) for n=1..18. MATHEMATICA f[x_] := x^2 + x + 1; a[1] = 1; a[n_] := LCM[f[n], a[n - 1]]; Array[a, 18] CROSSREFS Cf. A193181. Sequence in context: A123694 A319978 A085026 * A181475 A249640 A248226 Adjacent sequences: A221129 A221130 A221131 * A221133 A221134 A221135 KEYWORD nonn AUTHOR Robert G. Wilson v, Jan 02 2013 STATUS approved

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Last modified March 1 11:54 EST 2024. Contains 370432 sequences. (Running on oeis4.)