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A111215 Numbers n such that 4n + 5 is prime. 3
0, 2, 3, 6, 8, 9, 12, 14, 17, 21, 23, 24, 26, 27, 33, 36, 38, 42, 44, 47, 48, 56, 57, 59, 63, 66, 68, 69, 72, 77, 78, 83, 86, 87, 92, 96, 98, 99, 101, 104, 107, 111, 113, 114, 126, 129, 134, 138, 141, 143, 147, 149, 152, 153, 159, 162, 164, 167, 168, 174, 176, 182, 188 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Solutions of the equation (4*n+5)' = 1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Jan 03 2013

LINKS

Table of n, a(n) for n=1..63.

EXAMPLE

If n=99 then 4n + 5 = 401 (prime).

MATHEMATICA

Select[Range[0, 200], PrimeQ[4#+5]&] (* Harvey P. Dale, Dec 07 2013 *)

PROG

(MAGMA) [n: n in [0..200] | IsPrime(4*n+5)]; - Vincenzo Librandi, Nov 13 2010

(PARI) is(n)=isprime(4*n+5) \\ Charles R Greathouse IV, Aug 31 2015

CROSSREFS

Cf. A005098, A095278.

Sequence in context: A135768 A287659 A047244 * A099381 A289943 A089437

Adjacent sequences:  A111212 A111213 A111214 * A111216 A111217 A111218

KEYWORD

nonn,easy

AUTHOR

Parthasarathy Nambi, Oct 24 2005

STATUS

approved

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Last modified January 28 13:14 EST 2020. Contains 331321 sequences. (Running on oeis4.)