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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A262972 Numbers n such that 4^n + 33 is prime. 1
1, 3, 6, 7, 10, 15, 30, 34, 54, 58, 103, 105, 205, 223, 279, 741, 2098, 3523, 9210, 37674, 89895, 101509 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Contains exactly the halved even terms of A247953.

LINKS

Table of n, a(n) for n=1..22.

MATHEMATICA

Select[Range[0, 250000], PrimeQ[4^# + 33] &]

PROG

(MAGMA) [n: n in [0..700] | IsPrime(4^n+33)]; // Vincenzo Librandi, Oct 06 2015

(PARI) for(n=1, 1e3, if(isprime(4^n+33), print1(n", "))) \\ Altug Alkan, Oct 06 2015

CROSSREFS

Cf. A247953.

Cf. similar sequences of the type "Numbers n such that 4^n+k is prime" listed in A253772.

Sequence in context: A285569 A024412 A255508 * A115127 A258354 A028754

Adjacent sequences:  A262969 A262970 A262971 * A262973 A262974 A262975

KEYWORD

nonn,more

AUTHOR

Robert Price, Oct 05 2015

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.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 22 23:15 EDT 2017. Contains 288633 sequences.