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A250843
Primes of the form 6^x + y^6 with x, y > 0.
2
7, 37, 1297, 15661, 16921, 304606801, 594823357, 1838266921, 1898731801, 4751783857, 13841287237, 13841567137, 13901753377, 26901981217, 42180533677, 42182213257, 51520374397, 51522053977, 75418891921, 92205451297, 106044804721
OFFSET
1,1
LINKS
EXAMPLE
37 is in this sequence because 37 is prime and 6^2+1^6 = 37.
16921 is in this sequence because 16921 is prime and 6^4+5^6 = 16921.
MAPLE
N:= 10^12: # for all terms <= N
S:= {}:
for y from 1 while y^6 < N do
for x from 1 do
v:= 6^x + y^6;
if v > N then break fi;
if isprime(v) then
S:= S union {v};
fi
od od:
sort(convert(S, list)); # Robert Israel, Nov 11 2019
CROSSREFS
Cf. A250547.
Cf. similar sequences listed in A250481.
Sequence in context: A155010 A292807 A210620 * A078303 A127729 A129736
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 01 2014
EXTENSIONS
Missing terms inserted by Robert Israel, Nov 11 2019
STATUS
approved