OFFSET
1,1
COMMENTS
Subsequence of A224164, in which only the main diagonal is requested to be a reversible prime. Suggested by Charles R Greathouse IV.
The smallest terms with 4, 9, 16, 25 and 36 digits are 1117, 179991179, 1193100992213191, 1119710007705077000179111 and 111119100049100049928141172283919913.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..10000
EXAMPLE
When the digits of the prime p = 3391382115599173 are arranged in a 4 X 4 matrix:
3391
3821
1559
9173
the rows, the columns and the two main diagonals are 4-digit reversible primes, so p is in the sequence.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Apr 05 2013
STATUS
approved