A058255 - OEIS

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

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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