OFFSET

1,3

COMMENTS

Integers n such that n^n = (x^2 + y^3)/2 where x, y > 0, is soluble.

EXAMPLE

13 is a term because 13^13 = (24134045^2 + 28561^3)/2.

PROG

(PARI) isA055394(n)=for(k=1, sqrtnint(n-1, 3), if(issquare(n-k^3), return(1))); 0

is(n)=isA055394(2*n^n) \\ Charles R Greathouse IV, Jun 08 2016

CROSSREFS

KEYWORD

nonn,more

AUTHOR

Altug Alkan, May 26 2016

EXTENSIONS

a(10)-a(12) from Giovanni Resta, May 26 2016

STATUS

approved