A101789 8n-1 such that 4n-1 and 8n-1 are primes.

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

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