A098815 2^p - 7 where p is prime.

-3, 1, 25, 121, 2041, 8185, 131065, 524281, 8388601, 536870905, 2147483641, 137438953465, 2199023255545, 8796093022201, 140737488355321, 9007199254740985, 576460752303423481, 2305843009213693945, 147573952589676412921, 2361183241434822606841

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..200

Eric Weisstein's World of Mathematics, Ramanujan's Square Equation

Example

If p = 3, then 2^3 - 7 = 1.
If p = 5, then 2^5 - 7 = 25.

Mathematica

Table[2^Prime[n] - 7, {n, 20}]

Prog

(Magma) [2^p-7: p in PrimesUpTo(100)]; // Vincenzo Librandi, Apr 29 2014

Crossrefs

Sequence in context: A156654 A087071 A363736 * A300457 A289329 A033464

Adjacent sequences: A098812 A098813 A098814 * A098816 A098817 A098818

Keyword

sign

Author

Parthasarathy Nambi, Oct 07 2004

Extensions

More terms from Ray Chandler, Nov 14 2004

Status

approved