Phi-Prime
المؤلف:
Sloane, N. J. A
المصدر:
Sequences A064117, A064119, A118839, A118841, and A118842 in "The On-Line Encyclopedia of Integer Sequences."
الجزء والصفحة:
...
26-9-2020
1483
Phi-Prime
A phi-prime is a prime number appearing in the decimal expansion of the golden ratio 
. The first few are 1618033, 1618033988749, ... (OEIS A064117). The numbers of decimal digits in these examples are 7, 13, 255, 280, 97241, ... (OEIS A064119). There are no others with less than 
digits (M. Rodenkirch, Jun. 20, 2017).
Another set of phi-related primes is the positive integers 
such that 
is prime, where 
is the floor function. The first few are 2, 5, 6, 7, 11, 13, 17, 19, 24, 31, 37, 41, 47, 48, 53, 61, 71, 79, 96, 113, 313, 353, 503, 613, 617, 863, ... (OEIS A059791), corresponding to the primes 2, 11, 17, 29, 199, 521, 3571, 9349, ... (OEIS A118839).
Similarly, the first few 
such that ![[phi^n]](https://mathworld.wolfram.com/images/equations/Phi-Prime/Inline7.gif)
is prime, where ![[x]](https://mathworld.wolfram.com/images/equations/Phi-Prime/Inline8.gif)
is the ceiling function are 1, 2, 3, 4, 8, 16, ... (OEIS A118841), with no others less than 
, corresponding to the primes 2, 3, 5, 7, 47, 2207, ... (OEIS A118842).
REFERENCES:
Rodenkirch, M. "Primes in 
(phi)." Jun. 20, 2017. https://www.mersenneforum.org/showthread.php?p=461643#post461643.
Prime Curios! "16180...05887 (280-digits)." https://primes.utm.edu/curios/page.php?number_id=1206.
Sloane, N. J. A. Sequences A064117, A064119, A118839, A118841, and A118842 in "The On-Line Encyclopedia of Integer Sequences."
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