login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A182374 Primes of the form n*3^n + 1. 0
19, 52489, 59296646043258913, 3140085798164163223281069127, 281013956365219695455558985684629594690518822413326510467 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Similar to A060353, and to the Woodall primes A050918.

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

19 = 2*3^2 + 1; 52489 = 8*3^8 + 1; a(3) = 32*3^32 + 1; a(4) = 54*3^54 + 1.

MAPLE

#choose N large, then S is the desired set

f:=n->n*3^n + 1:

S:={}:

for n from 0 to N do if(isprime(f(n))) then S:=S union {f(n)}: fi: od

MATHEMATICA

Select[Table[n*3^n + 1, {n, 0, 580}], PrimeQ] (* Jayanta Basu, Jun 01 2013 *)

CROSSREFS

Cf. A060353, A050918.

Sequence in context: A068734 A216529 A145851 * A034207 A098970 A172751

Adjacent sequences:  A182371 A182372 A182373 * A182375 A182376 A182377

KEYWORD

nonn

AUTHOR

Patrick Devlin, Apr 26 2012

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 March 26 18:36 EDT 2019. Contains 321511 sequences. (Running on oeis4.)