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A216295 Values of n such that 10n + 1 is the only prime between 10n and 10n + 9. 1
18, 21, 24, 42, 63, 66, 69, 81, 102, 105, 117, 120, 138, 147, 151, 153, 180, 181, 183, 195, 216, 222, 225, 231, 252, 262, 273, 286, 297, 300, 312, 319, 327, 333, 336, 339, 357, 393, 411, 420, 423, 426, 462, 469, 480, 483, 486, 501, 526, 528, 535, 553, 558 (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) ~ 0.4 n log 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}, AppendTo[t, n]], {n, 0, 669}]; t (* T. D. Noe, Sep 03 2012 *)

CROSSREFS

Cf. A032352, A007811, A078494.

Sequence in context: A115747 A303686 A185099 * A217058 A172052 A001101

Adjacent sequences:  A216292 A216293 A216294 * A216296 A216297 A216298

KEYWORD

nonn

AUTHOR

V. Raman, Sep 03 2012

STATUS

approved

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Last modified May 31 16:29 EDT 2020. Contains 334748 sequences. (Running on oeis4.)