|
|
A104301
|
|
Primes which are the reverse concatenation of two consecutive square numbers.
|
|
5
|
|
|
41, 6449, 196169, 576529, 11561089, 14441369, 27042601, 38443721, 51845041, 60845929, 67246561, 84648281, 1081610609, 2073620449, 2190421609, 2822427889, 3240032041, 4000039601, 4326442849, 5017649729, 5290052441, 6250062001
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
EXAMPLE
|
The first term is 41 which is a prime and is the reverse concatenation of 1 and 4 which are two consecutive square numbers.
|
|
PROG
|
(Python)
from sympy import isprime
for n in range(1, 2000):
....x = int(str((n+1)**2)+str(n**2))
....if isprime(x):
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|