A363998 Primes of the form |2^i - 3^j|, for i >= 0, j >= 0.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 47, 61, 73, 79, 101, 127, 139, 179, 211, 227, 229, 239, 241, 269, 431, 503, 509, 601, 727, 997, 1021, 1163, 1319, 1931, 2039, 2179, 3299, 3853, 4093, 4513, 6529, 6553, 7949, 8111, 8191, 11491, 14197, 16141, 16381

Offset

1,1

Links

Table of n, a(n) for n=1..51.

Example

As in A014121, numbers of the form |2^i - 3^j|, for i >=0, j>=0 are 0,1,2,3,5,7,8,11,..., in which the primes are 2,3,5,7,11,... .

Mathematica

z = 500;
t = Table[Abs[2^i - 3^j], {i, 0, z}, {j, 0, z}];
v = Union[Sort[Flatten[t]]]; (* A014121*)
Intersection[v, Prime[Range[200000]]]   (* A363998 *)

Crossrefs

Complement of A007643.

Cf. A000040, A000079, A000244, A014121, A321671, A363999, A364000.

Sequence in context: A238242 A197298 A211654 * A038612 A012883 A296915

Adjacent sequences: A363995 A363996 A363997 * A363999 A364000 A364001

Keyword

nonn

Author

Clark Kimberling, Jul 30 2023

Status

approved