This site is supported by donations to The OEIS Foundation.

 Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A030637 Numbers with 19 divisors. 22
 262144, 387420489, 3814697265625, 1628413597910449, 5559917313492231481, 112455406951957393129, 14063084452067724991009, 104127350297911241532841, 3244150909895248285300369, 210457284365172120330305161, 699053619999045038539170241 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 18th powers of primes. The n-th number with p divisors is equal to the n-th prime raised to power p-1, where p is prime. - Omar E. Pol, May 06 2008 LINKS R. J. Mathar, Table of n, a(n) for n = 1..1000 FORMULA a(n)=A000040(n)^(19-1)=A000040(n)^(18). - Omar E. Pol, May 06 2008 MATHEMATICA Prime[Range[18]]^18 (* Vladimir Joseph Stephan Orlovsky, May 05 2011 *) PROG (PARI) is(n)=isprimepower(n)==18 \\ Charles R Greathouse IV, Jun 19 2016 CROSSREFS Cf. A000040, A030634, A030635, A030636. Sequence in context: A016905 A017700 A010806 * A236226 A183818 A016965 Adjacent sequences:  A030634 A030635 A030636 * A030638 A030639 A030640 KEYWORD nonn,easy AUTHOR EXTENSIONS a(6) corrected, Mar 26 2007 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 19 01:44 EST 2017. Contains 294912 sequences.