OFFSET
1,1
LINKS
V. Raman, Table of n, a(n) for n = 1..10000
FORMULA
a(n) >> n log^2 n. - Charles R Greathouse IV, Sep 07 2012
EXAMPLE
23 is in the sequence because between 230 and 239 there are exactly two primes: 233 and 239. [Bruno Berselli, Sep 04 2012]
MATHEMATICA
t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[Length[ps] == 2, AppendTo[t, n]], {n, 0, 229}]; t (* T. D. Noe, Sep 03 2012 *)
Select[Range[200], Count[Range[10#, 10#+9], _?PrimeQ]==2&] (* Harvey P. Dale, Jan 19 2017 *)
PROG
(Magma) [n: n in [1..200] | #PrimesInInterval(10*n, 10*n+9) eq 2]; // Bruno Berselli, Sep 04 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
V. Raman, Sep 03 2012
STATUS
approved