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A098815
2^p - 7 where p is prime.
3
-3, 1, 25, 121, 2041, 8185, 131065, 524281, 8388601, 536870905, 2147483641, 137438953465, 2199023255545, 8796093022201, 140737488355321, 9007199254740985, 576460752303423481, 2305843009213693945, 147573952589676412921, 2361183241434822606841
OFFSET
1,1
LINKS
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
KEYWORD
sign
AUTHOR
Parthasarathy Nambi, Oct 07 2004
EXTENSIONS
More terms from Ray Chandler, Nov 14 2004
STATUS
approved