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A208768 The distinct values of A070198. 4
0, 1, 5, 11, 59, 419, 839, 2519, 27719, 360359, 720719, 12252239, 232792559, 5354228879, 26771144399, 80313433199, 2329089562799, 72201776446799, 144403552893599, 5342931457063199, 219060189739591199, 9419588158802421599, 442720643463713815199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

The terms of A070198, and duplicates removed.

a(n) = A051451(n) - 1 = A051452(n) - 2.

From Daniel Forgues, Apr 27 2014: (Start)

Factorizations:

  5, 11, 59, 419, 839 are primes;

  2519 = 11*229, 27719 = 53*523, 360359 = 173*2083,

  720719 = 31*67*347, 12252239 = 29*647*653;

  232792559, 5354228879 are primes;

  26771144399 = 47*12907*44131, 80313433199 = 29*61*45400471;

  2329089562799 is prime;

  72201776446799 = 37*149*239*1091*50227;

  144403552893599 is prime;

Very likely contains an infinite number of primes (see A057824). (End)

A more natural (compare with A051452) name for the sequence: lcm(1, ..., k) - 1, where k is the n-th prime power A000961(n). - Daniel Forgues, May 09 2014

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..250

PROG

(Haskell)

import Data.List (nub)

a208768 n = a208768_list !! (n-1)

a208768_list = nub a070198_list

CROSSREFS

Sequence in context: A104357 A104364 A136669 * A057824 A057822 A168243

Adjacent sequences:  A208765 A208766 A208767 * A208769 A208770 A208771

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Mar 01 2012

STATUS

approved

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Last modified June 21 00:57 EDT 2021. Contains 345329 sequences. (Running on oeis4.)