A101793 16k-1 such that 4k-1, 8k-1 and 16k-1 are primes.

47, 719, 1439, 2879, 4079, 4127, 5807, 6047, 7247, 7727, 9839, 10799, 11279, 13967, 14159, 15647, 21599, 24527, 28319, 28607, 42767, 44687, 45887, 48479, 51599, 51839, 67247, 68639, 72767, 77279, 79967, 81647, 84047, 84719, 89087, 92399, 95279, 96959, 98207

Offset

1,1

Links

Table of n, a(n) for n=1..39.

Example

4*3-1=11, 8*3-1=23 and 16*3-1=47 are primes, so the first entry is 47.

Mathematica

16#-1&/@Select[Range[10000], AllTrue[{4#-1, 8#-1, 16#-1}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Jun 13 2015 *)

Crossrefs

Cf. A002515, A101790, A101791, A101792.

Sequence in context: A106310 A163709 A244880 * A262120 A032626 A009054

Adjacent sequences: A101790 A101791 A101792 * A101794 A101795 A101796

Keyword

easy,nonn

Author

Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 16 2004

Status

approved