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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A172070 Primes p such that either p-1/2-+5/2, but not both, is prime. 0
3, 11, 17, 29, 41, 59, 71, 101, 107, 137, 149, 179, 191, 197, 227, 239, 269, 281, 311, 347, 419, 431, 461, 521, 569, 599, 617, 641, 659, 809, 821, 827, 857, 881, 1019, 1031, 1049, 1061, 1091, 1151, 1229, 1277, 1289, 1301, 1319, 1427, 1451, 1481, 1487, 1607, 1619, 1667, 1697, 1721, 1787, 1871, 1877 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Lesser of twin primes without 5.

LINKS

Table of n, a(n) for n=1..57.

EXAMPLE

a(1)=3 because 3-1/2-5/2=0(nonprime) and 3-1/2+5/2=5(prime).

CROSSREFS

Cf. A001359.

Sequence in context: A126691 A154613 A109654 * A038986 A276848 A194800

Adjacent sequences:  A172067 A172068 A172069 * A172071 A172072 A172073

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Jan 25 2010

EXTENSIONS

Entries checked by R. J. Mathar, May 02 2010

More terms from and definition clarified by Harvey P. Dale, Jul 22 2014

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 22 04:32 EDT 2019. Contains 321406 sequences. (Running on oeis4.)