OFFSET
1,1
COMMENTS
5 is a term because x^4 + y*x^3 + y^2*x^2 + y^3*x + y^4 = 5 when x=y=1. - N. J. A. Sloane, May 12 2014
REFERENCES
A. J. C. Cunningham, Binomial Factorisations, Vols. 1-9, Hodgson, London, 1923-1929; see Vol. 2, p. 200.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Jens Kruse Andersen, Table of n, a(n) for n = 1..10000
A. J. C. Cunningham, Binomial Factorisations, Vols. 1-9, Hodgson, London, 1923-1929. [Annotated scans of a few pages from Volumes 1 and 2]
PROG
(PARI) m=10^6; v=[5]; for(x=1, m^(1/4), for(y=1, x-1, n=(x^5-y^5)/(x-y); if(n<=m && isprime(n), v=concat(v, n)))); vecsort(v) \\ Jens Kruse Andersen, Jul 14 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(26)-a(35) from Sean A. Irvine, May 08 2014
STATUS
approved