OFFSET
1,2
COMMENTS
It is conjectured that sequence is infinite.
REFERENCES
Leonard E. Dickson: History of the Theory of numbers, vol. I, Dover Publications 2005
Friedhelm Padberg, Elementare Zahlentheorie, Spektrum Akademischer Verlag, 2. Auflage 1991
EXAMPLE
(1) 3^3+10^2*1^3=127=prime(31) gives a(1)=1
(2) 3^3+10^2*2^3=827=prime(144) gives a(2)=2
(3) 3^3+10^2*13^3=219727=prime(19588) gives a(6)=13
MATHEMATICA
Select[Range[300], PrimeQ[100#^3+27]&] (* Harvey P. Dale, May 10 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Eva-Maria Zschorn (e-m.zschorn(AT)zaschendorf.km3.de), Nov 29 2009
EXTENSIONS
Edited by Charles R Greathouse IV, Apr 28 2010
STATUS
approved