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A242199 Numbers k such that k*16^k + 1 is prime. 3
1, 3, 55, 81, 223, 1227, 3012, 3301 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

G. Loeh, Generalized Cullen primes

MATHEMATICA

Select[Range[2000], PrimeQ[# 16^# + 1] &]

PROG

(Magma) [n: n in [0..2000] | IsPrime(n*16^n+1)];

(Sage) [n for n in (1..2000) if is_prime(n*16^n + 1)] # Bruno Berselli, May 09 2014

(PARI) is(n)=ispseudoprime(n*16^n+1) \\ Charles R Greathouse IV, Jun 06 2017

CROSSREFS

Cf. similar sequences listed in A242176.

Sequence in context: A227054 A340214 A088278 * A268661 A041155 A111483

Adjacent sequences: A242196 A242197 A242198 * A242200 A242201 A242202

KEYWORD

nonn,more

AUTHOR

Vincenzo Librandi, May 08 2014

EXTENSIONS

a(7)-a(8) from Loeh's list (see Links)

STATUS

approved

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Last modified March 25 22:04 EDT 2023. Contains 361529 sequences. (Running on oeis4.)