login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A051452 a(n) = 1 + lcm(1..k) where k is the n-th prime power A000961(n). 2
2, 3, 7, 13, 61, 421, 841, 2521, 27721, 360361, 720721, 12252241, 232792561, 5354228881, 26771144401, 80313433201, 2329089562801, 72201776446801, 144403552893601, 5342931457063201, 219060189739591201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

From Daniel Forgues, Apr 27 2014: (Start)

Factorizations:

  2, 3, 7, 13, 61, 421 are primes;

  841 = 29^2;

  2521 is prime;

  27721 = 19*1459, 360361 = 89*4049, 720721 = 71*10151,

  12252241 = 1693*7237;

  232792561 is prime;

  5354228881 = 6659*804059;

  26771144401 is prime;

  80313433201 = 331*11239*21589, 2329089562801 = 101*271*2311*36821;

  72201776446801 is prime.

Very likely contains an infinite number of primes (see A049536). (End)

LINKS

Table of n, a(n) for n=1..21.

PROG

(PARI) print1(2); t=1; for(n=2, 100, if(t%n, t=lcm(t, n); print1(", "t+1))) \\ Charles R Greathouse IV, Jan 04 2013

CROSSREFS

1 + A003418(A000961(n)), corresponds to distinct values of 1 + A003418.

Cf. A049536, A049537, A051454, A208768.

Sequence in context: A089136 A092965 A051454 * A058017 A049536 A065508

Adjacent sequences:  A051449 A051450 A051451 * A051453 A051454 A051455

KEYWORD

nonn

AUTHOR

Labos Elemer

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 16 15:17 EST 2020. Contains 331961 sequences. (Running on oeis4.)