A157036 Shorthand for A157035, the largest prime with 2^n digits.
3, 3, 27, 11, 63, 21, 51, 17, 813, 377, 7017, 27381, 7763, 1133, 119387, 67347, 121877
Offset: 0
Programs
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Maple
a:= n-> (t-> t-prevprime(t))(10^(2^n)): seq(a(n), n=0..10); # Alois P. Heinz, Mar 02 2022
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PARI
{ a(n) = 10^(2^n) - precprime(10^(2^n)) } \\ Max Alekseyev, Mar 28 2009 -
Python
from sympy import prevprime def a(n): return 10**(2**n) - prevprime(10**(2**n)) print([a(n) for n in range(10)]) # Michael S. Branicky, Mar 02 2022
Extensions
a(8)-a(13) from Ray Chandler and Max Alekseyev, Mar 22 2009
a(14) from Jinyuan Wang, Feb 22 2022
a(15) from Michael S. Branicky, Jun 19 2024
a(16) from Michael S. Branicky, Jun 27 2024
Comments