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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A147667 Primes of the form 5^n - 4^n. 2
 61, 1136791005963704961126617632861, 173472015290681763212224222187425603741981, 31861838222649045530727106406255616308752331078816472270207782250106896363274089867800367051529351065966102374800998198276889145001421 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are odd, and if n is even, then 5^n - 4^n is divisible by 3. [Vincenzo Librandi, Nov 25 2010] The next term (a(5)) has 156 digits. - Harvey P. Dale, May 14 2022 LINKS Muniru A Asiru, Table of n, a(n) for n = 1..9 EXAMPLE 5^3 - 4^3 = 125 - 64 = 61. MAPLE select(isprime, [seq(5^n - 4^n, n=0..200)]); # Muniru A Asiru, Mar 04 2018 MATHEMATICA lst={}; Do[p=5^n-4^n; If[PrimeQ[p], AppendTo[lst, p]], {n, 6!}]; lst Select[Table[5^n-4^n, {n, 300}], PrimeQ] (* Harvey P. Dale, May 14 2022 *) PROG (GAP) Filtered(List([1..200], n->5^n - 4^n), IsPrime); # Muniru A Asiru, Mar 04 2018 CROSSREFS Cf. A059802 (corresponding n). Sequence in context: A087513 A176272 A173418 * A022084 A110823 A058913 Adjacent sequences:  A147664 A147665 A147666 * A147668 A147669 A147670 KEYWORD nonn,changed AUTHOR Vladimir Joseph Stephan Orlovsky, Nov 10 2008 STATUS approved

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 May 18 06:28 EDT 2022. Contains 353783 sequences. (Running on oeis4.)