STATUS
reviewed
approved
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Revision History for A076515
(Bold, blue-underlined text is an addition; faded, red-underlined text is aShowing entries 1-10 | older changes
STATUS
proposed
reviewed
STATUS
editing
proposed
COMMENTS
No more terms up to 75000 (Previous previous range rechecked). All terms are multiples of 12: if k > 0 is not a multiple of 12, 1 + 3^k + 5^k is divisible by 3, 5 or 7. - Rick L. Shepherd, Aug 06 2017
Next term, if it exists, is greater than 100000010^6. - Jon Grantham, Jul 29 2023
EXTENSIONS
a(7) from Jon Grantham, Jul 29 2023
NAME
Numbers n k such that 1 + 3^n k + 5^n k is prime.
COMMENTS
No more terms up to 75000 (Previous range rechecked). All terms are multiples of 12: if n k > 0 is not a multiple of 12, 1 + 3^n k + 5^n k is divisible by 3, 5 or 7. - Rick L. Shepherd, Aug 06 2017
STATUS
proposed
editing
STATUS
editing
proposed
DATA
0, 12, 36, 48, 72, 120, 605376
COMMENTS
Next term, if it exists, is greater than 1000000. - Jon Grantham, Jul 29 2023
EXTENSIONS
a(7) from Jon Grantham
STATUS
approved
editing
PROG
(MAGMAMagma) [n: n in [0..1000]|IsPrime(3^n+5^n+1)] // Vincenzo Librandi, Jan 22 2011
STATUS
editing
approved