The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A243405 Minimum among the numbers p^(n/p), where p is a prime factor of n. 2
 1, 2, 3, 4, 5, 8, 7, 16, 27, 25, 11, 64, 13, 49, 125, 256, 17, 512, 19, 625, 343, 121, 23, 4096, 3125, 169, 19683, 2401, 29, 15625, 31, 65536, 1331, 289, 16807, 262144, 37, 361, 2197, 390625, 41, 117649, 43, 14641, 1953125, 529, 47, 16777216, 823543, 9765625, 4913, 28561, 53 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The setting a(1)=1 is conventional. Upper bound (for any n): a(n) <= (3^(1/3))^n = A002581^n. LINKS Stanislav Sykora, Table of n, a(n) for n = 1..2000 FORMULA For prime p, a(p)=p. For n>1: When gpf(n)>3 then a(n)=gpf(n)^(n/gpf(n)); otherwise if n is even then a(n)=2^(n/2); otherwise a(n)=3^(n/3). If n is in A033845, a(n) = 2^(n/2); otherwise a(n) = gpf(n)^(n/gpf(n)). - Franklin T. Adams-Watters, Jun 15 2014 EXAMPLE a(12)=64 because 2^(12/2)=64 is smaller than 3^(12/3)=81. PROG (PARI) A243405(n)= {my(m, k, p, q); if(n==1, return(1)); p=factor(n); m=2^n; for(k=1, #p[, 1], q=p[k, 1]^(n\p[k, 1]); if(q

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

Last modified July 21 16:10 EDT 2024. Contains 374475 sequences. (Running on oeis4.)