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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

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

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.)