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A216305 Values of k such that 10*k+1 and 10*k+9 alone are prime between 10*k and 10*k+9. 1
40, 49, 70, 76, 91, 157, 253, 274, 301, 304, 322, 349, 370, 388, 475, 505, 517, 622, 652, 715, 769, 817, 868, 931, 994, 1015, 1039, 1063, 1078, 1132, 1168, 1228, 1240, 1279, 1315, 1324, 1378, 1441, 1477, 1555, 1567, 1687, 1723, 1735, 1819, 1837, 1867, 1900 (list; graph; refs; listen; history; text; internal format)
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

MATHEMATICA

t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[ps == {10*n + 1, 10*n + 9}, AppendTo[t, n]], {n, 0, 3319}]; t (* T. D. Noe, Sep 04 2012 *)

CROSSREFS

Cf. A032352, A007811, A078494.

Sequence in context: A290017 A062909 A167327 * A173337 A167311 A039523

Adjacent sequences:  A216302 A216303 A216304 * A216306 A216307 A216308

KEYWORD

nonn

AUTHOR

V. Raman, Sep 03 2012

STATUS

approved

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Last modified April 26 12:00 EDT 2019. Contains 322472 sequences. (Running on oeis4.)