|
|
A057225
|
|
Numbers n such that (Product of first n Mersenne prime exponents) - 1 is prime.
|
|
1
|
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Position[FoldList[Times, MersennePrimeExponent[Range[30]]]-1, _?PrimeQ]//Flatten (* Harvey P. Dale, Oct 01 2023 *)
|
|
PROG
|
(PARI) lista(v) = {for (n=1, #v, if (isprime(prod(k=1, n, v[k]) - 1), print1(n, ", ")); ); } \\ with v=A000043. Michel Marcus, Jan 07 2014
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|