OFFSET
1,1
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Ramanujan's Tau Function.
EXAMPLE
a(1) = 1381 = 2*691 - 1 is a first prime of the form 2m*691 - 1.
MATHEMATICA
Select[ 2*691*Range[ 1000 ] - 1, PrimeQ[ # ] & ]
Select[Table[1382 n - 1, {n, 0, 300}], PrimeQ] (* Vincenzo Librandi, Nov 07 2014 *)
PROG
(Magma) [a: n in [0..250] | IsPrime(a) where a is 1382*n-1]; // Vincenzo Librandi, Nov 07 2014
(PARI) list(lim)=my(v=List()); forprimestep(p=1381, lim, Mod(-1, 1382), listput(v, p)); Vec(v) \\ Charles R Greathouse IV, Sep 09 2022
CROSSREFS
Cf. A046694 = Ramanujan tau numbers mod 691 = sum of 11th power of divisors mod 691.
Cf. A121733 = Numbers n such that two consecutive Ramanujan tau numbers are congruent mod 691.
Cf. A121742 = Numbers n such that three consecutive Ramanujan tau numbers are congruent mod 691.
Cf. A121743 = Values of the Ramanujan tau triples mod 691 such that three consecutive Ramanujan tau numbers are congruent mod 691.
KEYWORD
nonn,easy
AUTHOR
Alexander Adamchuk, Nov 05 2007
STATUS
approved