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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208178 Primes of the form 256*k + 1. 9
257, 769, 3329, 7681, 7937, 9473, 10753, 11777, 12289, 13313, 14081, 14593, 15361, 17921, 18433, 19457, 22273, 23041, 23297, 25601, 26113, 26881, 30977, 31489, 32257, 36097, 36353, 37633, 37889, 39937, 40193, 40961, 41729, 43777, 45569, 46337, 49409, 49921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Odd primes p such that -1 is a 128th power mod p. - Eric M. Schmidt, Mar 27 2014

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[256 Range[195] + 1, PrimeQ]

PROG

(PARI) for(n=1, 195, r=256*n+1; if(isprime(r), print1(r", ")));

(MAGMA) [ p: p in PrimesUpTo(50000) | p mod 256 eq 1 ];

(Haskell)

a208178 n = a208178_list !! (n-1)

a208178_list = filter ((== 1) . a010051) [1, 257..]

-- Reinhard Zumkeller, Mar 06 2012

CROSSREFS

Cf. A065091, A002144, A007519, A094407, A133870, A142925, A208177, A076339.

Sequence in context: A208177 A229855 A229856 * A105131 A202372 A036549

Adjacent sequences:  A208175 A208176 A208177 * A208179 A208180 A208181

KEYWORD

nonn,easy

AUTHOR

Bruno Berselli, Feb 25 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 18 00:38 EST 2017. Contains 294837 sequences.