A058255 Distinct values of lcm_{i=1..n} (p(i)-1), where p() are the primes.

1, 2, 4, 12, 60, 240, 720, 7920, 55440, 1275120, 16576560, 480720240, 19709529840, 39419059680, 197095298400, 3350620072800, 177582863858400, 532748591575200, 19711697888282400, 59135093664847200

Offset

1,2

Comments

The prime A095365(n) is the least prime yielding an LCM of a(n). This sequence and A095365 are related to A095366. - T. D. Noe, Jun 04 2004

Links

Michael De Vlieger, Table of n, a(n) for n = 1..360

Example

For p = 29, 31, 37, 41, 43 these LCMs are equal to 55440 = 11*7! = lcm[1, 2, 4, 6, 10, 12, 16, 22, 28, 30, 36, 40, 42] = lcm[1, 2, 4, 6, 10, 12, 16, 22, 28]. The values was put on the stage only once. Repetitions skipped.

Mathematica

Union@ Table[LCM @@ (Prime@ Range[1, n] - 1), {n, 38}] (* Michael De Vlieger, Dec 06 2018 *)

Crossrefs

A058254 with duplicates removed.

Cf. A002110, A005867, A003418, A054451, A000142, A000010.

Cf. A095366 (least k > 1 such that k divides 1^n + 2^n + ... + (k-1)^n).

Sequence in context: A155747 A058254 A076244 * A118456 A326861 A013202

Adjacent sequences: A058252 A058253 A058254 * A058256 A058257 A058258

Keyword

nonn

Author

Labos Elemer, Dec 06 2000

Status

approved