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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023228 Numbers n such that n and 8n + 1 are both prime. 5
2, 5, 11, 17, 29, 71, 101, 107, 131, 137, 149, 179, 239, 269, 347, 401, 431, 449, 479, 491, 509, 557, 599, 617, 659, 677, 761, 809, 821, 857, 929, 941, 947, 977, 1151, 1187, 1229, 1289, 1307, 1361, 1367, 1409, 1487, 1559, 1571, 1601, 1619, 1667, 1697, 1811, 1871 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

PROG

(MAGMA) [ p: p in PrimesUpTo(1900) | IsPrime(8*p+1) ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 21 2008]

CROSSREFS

Cf. A007519 (primes of form 8n+1), A005123 ((( primes == 1 mod 8 ) - 1)/8). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 21 2008]

Sequence in context: A089440 A055499 A014424 * A027429 A059987 A027426

Adjacent sequences:  A023225 A023226 A023227 * A023229 A023230 A023231

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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 17 11:46 EST 2012. Contains 206011 sequences.