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A168487 Primes of the form 100n^3 + 27. 1
127, 827, 6427, 12527, 34327, 219727, 491327, 1562527, 2438927, 3276827, 8518427, 16637527, 22698127, 43897627, 45653327, 51200027, 77868827, 119101627, 129502927, 140492827, 156089627, 177156127, 190662427, 251545627, 257135327 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

(1) These primes all with the end digits 2 and 7 are concatenations of two CUBIC numbers: "n^3 3^3".

(2) It is conjectured that sequence is infinite.

REFERENCES

Harold Davenport, Multiplicative Number Theory, Springer-Verlag New-York 1980

Leonard E. Dickson: History of the Theory of numbers, vol. I, Dover Publications 2005

Friedhelm Padberg, Elementare Zahlentheorie, Spektrum Akademischer Verlag, 2. Auflage 1991

LINKS

Table of n, a(n) for n=1..25.

MATHEMATICA

Select[100Range[140]^3+27, PrimeQ] (* Harvey P. Dale, Aug 22 2011 *)

CROSSREFS

A167535 Concatenation of two square numbers which give a prime

A168147 Primes of the form p = 1 + 10*n^3 for a natural number n

A168327 Primes of concatenated form p = "1 n^3"

Sequence in context: A060201 A140630 A183829 * A299057 A299818 A236304

Adjacent sequences:  A168484 A168485 A168486 * A168488 A168489 A168490

KEYWORD

nonn

AUTHOR

Eva-Maria Zschorn (e-m.zschorn(AT)zaschendorf.km3.de), Nov 27 2009

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 24 2010

STATUS

approved

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Last modified February 16 12:48 EST 2019. Contains 320163 sequences. (Running on oeis4.)