

A061421


Primes of the form 2^n+n+1.


8




OFFSET

1,1


COMMENTS

Next term is 2^1884+1884+1, with 568 digits and is too large to include.  Emeric Deutsch, May 13 2006
The Wikipedia article "Zeisel number" gives a historical connection to A051015.  Jonathan Sondow, Oct 17 2017


LINKS

Table of n, a(n) for n=1..4.
K. S. Brown, The Sum of the Prime Factors of N (Part 2: Primes of the Form 2k1 + k), Math Pages
Wikipedia, Zeisel number


MAPLE

a:=proc(n) if isprime(2^n+n+1)=true then 2^n+n+1 else fi end: seq(a(n), n=0..1000); # Emeric Deutsch, May 13 2006


MATHEMATICA

{ta={{0}}, tb={{0}}}; Do[g=n; s=2^n+n+1; If[PrimeQ[s], Print[n]; ta=Append[ta, n]; tb=Append[tb, s]], {n, 1, 10000}]; {ta, tb, g} (* Labos Elemer, Nov 19 2004 *)


CROSSREFS

Cf. A001580, A069539, A052007, A048744, A100357, A100358, A100359.
Cf. A061422.
Sequence in context: A230459 A267406 A100360 * A304192 A141315 A215637
Adjacent sequences: A061418 A061419 A061420 * A061422 A061423 A061424


KEYWORD

nonn


AUTHOR

Jason Earls, May 02 2001


EXTENSIONS

Edited by N. J. A. Sloane, May 04 2007


STATUS

approved



