

A085325


a(n) is the least number such that the minimal exponent for which rev[a(n)^n]=prime holds is n. Thus rev[a(n)^k] is composite for k=1,..n.


2



2, 4, 52, 61, 43, 49, 29, 8, 223, 53, 83, 59, 25, 568, 47, 221, 229, 1286, 427, 629, 637, 46, 109, 652, 458, 925, 1438, 86, 674, 535
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS



EXAMPLE

n=10, a(10)=53: This means that rev[53^10]=940315563074788471 is prime, but rev[53^k] is composite for k=1,...,9. Also, rev[a^10] for a<a(n)=53 is not prime. However a>53 is possible like e.g rev[103^10] is prime; 10 as the least exponent belongs to several bases of which a(10)=53 is the smallest one.


CROSSREFS



KEYWORD

base,nonn


AUTHOR



STATUS

approved



