The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A101789 8n-1 such that 4n-1 and 8n-1 are primes. 2
 7, 23, 47, 167, 263, 359, 383, 479, 503, 719, 839, 863, 887, 983, 1319, 1367, 1439, 1487, 1823, 2039, 2063, 2207, 2447, 2879, 2903, 2999, 3023, 3119, 3167, 3623, 3863, 4007, 4079, 4127, 4679, 4703, 4799, 4919, 5087, 5399, 5639, 5807, 5879, 5927, 6047 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..10000 EXAMPLE 4*1-1=3 and 8*1-1 = 7 are primes, so the first entry is 7. MATHEMATICA Select[Prime[Range[800]], Mod[#, 8]==7&&PrimeQ[(#-1)/2]&] (* Harvey P. Dale, Jan 31 2012 *) CROSSREFS Cf. A002515. Sequence in context: A153210 A185955 A158035 * A174590 A162290 A180044 Adjacent sequences: A101786 A101787 A101788 * A101790 A101791 A101792 KEYWORD easy,nonn AUTHOR Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 16 2004 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 19 13:04 EDT 2024. Contains 372692 sequences. (Running on oeis4.)