A273940 Primes of the form 5^n - n.

23, 15619, 244140613

Offset

1,1

Comments

Corresponding n are given in A058046.

The next term has 254 digits.

Links

Table of n, a(n) for n=1..3.

Mathematica

Select[Table[5^n - n, {n, 400}], PrimeQ]

Prog

(Magma) [a: n in [0..400] | IsPrime(a) where a is 5^n-n];
(PARI) forstep(n=2, 1e4, 2, if(ispseudoprime(t=5^n-n), print1(t", "))) \\ Charles R Greathouse IV, Jun 08 2016

Crossrefs

Cf. primes of the form k^n - n: A081296 (k=2), A224420 (k=3), A224451 (k=4), this sequence (k=5), A273941 (k=6), A224468 (k=7), A224469 (k=8).

Cf. A058046.

Sequence in context: A013728 A028693 A324255 * A348307 A033998 A157167

Adjacent sequences: A273937 A273938 A273939 * A273941 A273942 A273943

Keyword

nonn,bref

Author

Vincenzo Librandi, Jun 05 2016

Status

approved