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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A002257 Numbers n such that 13*4^n + 1 is prime.
(Formerly M3247 N1310)
1
1, 4, 5, 10, 14, 41, 94, 154, 158, 500 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

H. Riesel, ``Prime numbers and computer methods for factorization,'' Progress in Mathematics, Vol. 57, Birkhauser, Boston, 1985, Chap. 4, see pp. 381-384.

R. M. Robinson, A report on primes of the form k.2^n+1 and on factors of Fermat numbers, Proc. Amer. Math. Soc., 9 (1958), 673-681.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Ray Ballinger, Proth Search Page

MATHEMATICA

Select[Range[2000], PrimeQ[13 4^#+1]&]  [From Harvey P. Dale, Jan. 22, 2011]

PROG

(MAGMA) [ n: n in [1..800]|IsPrime(13*4^n+1)][From V.Librandi, Nov 21 2010]

CROSSREFS

See A032356 for more terms.

Sequence in context: A114517 A116930 A073119 * A101528 A119040 A135104

Adjacent sequences:  A002254 A002255 A002256 * A002258 A002259 A002260

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 16:29 EST 2012. Contains 205635 sequences.