A101795 4n-1 such that 4n-1, 8n-1, 16n-1 and 32n-1 are primes.

179, 359, 2699, 3539, 12119, 17159, 27479, 53639, 57839, 63419, 71399, 74699, 82499, 87539, 101399, 107279, 107699, 112919, 122099, 122819, 126839, 127139, 133499, 139439, 166739, 167759, 229739, 253679, 254279, 287219, 296099

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

4*45-1=179, 8*45-1=359, 16*45-1=719 and 32*45-1=1439 are primes, so the first entry is 179.

Mathematica

Select[Table[4n-1, {n, 75000}], AllTrue[(#+1)*{1, 2, 4, 8}-1, PrimeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 23 2019 *)

Crossrefs

Cf. A002515, A101794, A101796, A101797, A101798.

Sequence in context: A142670 A142948 A109985 * A142389 A063350 A094492

Adjacent sequences: A101792 A101793 A101794 * A101796 A101797 A101798

Keyword

easy,nonn

Author

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

Status

approved