A368901 The least common multiple of the first n terms of Doudna sequence, A005940.

1, 1, 2, 6, 12, 60, 60, 180, 360, 2520, 2520, 2520, 2520, 12600, 12600, 37800, 75600, 831600, 831600, 831600, 831600, 831600, 831600, 831600, 831600, 5821200, 5821200, 5821200, 5821200, 29106000, 29106000, 87318000, 174636000, 2270268000, 2270268000, 2270268000, 2270268000, 2270268000, 2270268000, 2270268000, 2270268000

Offset

0,3

Links

Table of n, a(n) for n=0..40.

Formula

a(0) = 1, and for n > 0, a(n) = lcm(A005940(n), a(n-1)).

a(0) = 1, and for n > 0, a(n) = A368900(n) * a(n-1).

Prog

(PARI)
A005940(n) = { my(p=2, t=1); n--; until(!n\=2, if((n%2), (t*=p), p=nextprime(p+1))); (t) };
A368901(n) = lcm(vector(n, i, A005940(i)));

Crossrefs

Cf. A005940, A368900.

Cf. also A003418.

Sequence in context: A343277 A341617 A083268 * A225628 A284650 A085911

Adjacent sequences: A368898 A368899 A368900 * A368902 A368903 A368904

Keyword

nonn

Author

Antti Karttunen and David James Sycamore, Jan 10 2024

Status

approved