Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #9 Sep 14 2014 00:20:48
%S 41,6449,196169,576529,11561089,14441369,27042601,38443721,51845041,
%T 60845929,67246561,84648281,1081610609,2073620449,2190421609,
%U 2822427889,3240032041,4000039601,4326442849,5017649729,5290052441,6250062001
%N Primes which are the reverse concatenation of two consecutive square numbers.
%e The first term is 41 which is a prime and is the reverse concatenation of 1 and 4 which are two consecutive square numbers.
%o (Python)
%o from sympy import isprime
%o A104301_list = []
%o for n in range(1,2000):
%o ....x = int(str((n+1)**2)+str(n**2))
%o ....if isprime(x):
%o ........A104301_list.append(x) # _Chai Wah Wu_, Sep 13 2014
%Y These are the primes in A246972.
%Y Cf. A104242.
%K base,nonn
%O 1,1
%A _Shyam Sunder Gupta_, Apr 17 2005