This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A238399 a(n) is the number of primes occurring between A053182(n) and A053183(n) (excluding the endpoints). 2
 2, 3, 7, 55, 255, 478, 663, 984, 1237, 1955, 3021, 3214, 8312, 13519, 38267, 40805, 45400, 47444, 48835, 55269, 56758, 59032, 66067, 92141, 93063, 103620, 106611, 108602, 112713, 140874, 151335, 163314, 178215, 183330, 211350, 235410, 244165, 265160, 275971 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Giovanni Resta, Table of n, a(n) for n = 1..2500 MATHEMATICA (PrimePi[#^2 + #] - PrimePi[#]) & /@  Select[Prime@Range@500, PrimeQ[#^2 + # + 1] &] (* Giovanni Resta, Feb 27 2014 *) CROSSREFS Cf. A053182, A053183 Sequence in context: A271041 A270402 A253574 * A159611 A156585 A299923 Adjacent sequences:  A238396 A238397 A238398 * A238400 A238401 A238402 KEYWORD nonn AUTHOR Torlach Rush, Feb 26 2014 EXTENSIONS a(33)-a(39) from Giovanni Resta, Feb 27 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 14 08:54 EDT 2019. Contains 327995 sequences. (Running on oeis4.)