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 A301633 Numbers k such that 4^(2*k) + 2*k + 1 is a prime. 2
 0, 1, 33, 123, 235, 513, 3441, 5836 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Next term, if it exists, is greater than 10000. - Vaclav Kotesovec, Mar 25 2018 LINKS MAPLE a:=n->`if`(isprime(4^(2*k)+2*k+1), k, NULL): seq(a(k), k=0..5000); # Muniru A Asiru, Mar 25 2018 MATHEMATICA Flatten[{0, Select[Range[1000], PrimeQ[16^# + 2*# + 1] &]}] (* Vaclav Kotesovec, Mar 25 2018 *) PROG (PARI) for(n=0, 500, if(isprime(4^(2*n)+2*n+1), print1(n", "))) CROSSREFS A301637 gives the primes. Cf. A173053, A301632. Sequence in context: A044665 A140161 A177211 * A039440 A235902 A235895 Adjacent sequences:  A301630 A301631 A301632 * A301634 A301635 A301636 KEYWORD nonn,more AUTHOR Seiichi Manyama, Mar 25 2018 EXTENSIONS a(7) from Muniru A Asiru, Mar 25 2018 a(8) from Vaclav Kotesovec, Mar 25 2018 STATUS approved

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Last modified January 23 01:48 EST 2020. Contains 331166 sequences. (Running on oeis4.)