OFFSET
1,1
COMMENTS
The squares of all palindromic primes (A002385) are a subsequence and these are the only perfect squares.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..10000
EXAMPLE
121 is a term because 121 = 11 * 11.
403 is a term because 403 = 13 * 31.
1207 is a term because 1207 = 17 * 71.
2701 is a term because 2701 = 37 * 73.
PROG
(PARI) upto(lim)={my(L=List()); forprime(p=2, sqrtint(lim), my(q=fromdigits(Vecrev(digits(p)))); if(isprime(q) && p*q<=lim, listput(L, p*q))); Set(L)}
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Andrew Howroyd, Oct 03 2024
STATUS
approved