1,1

Table of n, a(n) for n=1..22.

The first term is 41 which is a prime and is the reverse concatenation of 1 and 4 which are two consecutive square numbers.

(Python)

from sympy import isprime

A104301_list = []

for n in range(1, 2000):

....x = int(str((n+1)**2)+str(n**2))

....if isprime(x):

........A104301_list.append(x) # Chai Wah Wu, Sep 13 2014

These are the primes in A246972.

Cf. A104242.

Sequence in context: A091758 A208255 A221325 * A221300 A221377 A160477

Adjacent sequences: A104298 A104299 A104300 * A104302 A104303 A104304

base,nonn

Shyam Sunder Gupta, Apr 17 2005

approved