A302123
Numbers k such that 6*k^k - 5 is prime.
Original entry on oeis.org
2, 3, 4, 7, 8, 9, 33, 138, 251, 467, 489, 9894
Offset: 1
Numbers k such that b*k^k - b + 1 is prime:
A301521 (b=4), this sequence (b=6).
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Select[Range[1, 1000], PrimeQ[6*#^# - 5] &] (* Vaclav Kotesovec, Apr 02 2018 *)
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for(n=0, 300, if(isprime(6*n^n-5), print1(n", ")))
A302091
Primes of form 6*k^k + 5.
Original entry on oeis.org
11, 29, 167, 279941, 4941263
Offset: 1
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Select[Table[6 n^n + 5, {n, 20}], PrimeQ] (* Harvey P. Dale, Oct 24 2021 *)
A302088
Numbers k such that 5*k^k + 4 is prime.
Original entry on oeis.org
3, 5, 9, 183, 561
Offset: 1
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Select[Range[1, 1000], PrimeQ[5*#^# + 4] &] (* Vaclav Kotesovec, Apr 01 2018 *)
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for(n=0, 500, if(isprime(5*n^n+4), print1(n", ")))
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lista(nn) = forstep(n=1, nn, 2, if(ispseudoprime(5*n^n+4), print1(n, ", "))); \\ Altug Alkan, Apr 01 2018
Showing 1-3 of 3 results.
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