57137...97531 (209-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

 571371171 9617615613 6116195175 1551351151 9417415413 4114193173 1531331131
9217215213 2112191171 1511311111 9017015013 0110199795 9391998785 8381897775
7371796765 6361695755 5351594745 4341493735 3331392725 2321291715 1311197531

Just showing those entries submitted by 'Gupta': (Click here to show all)

The largest non-titanic prime formed from the reversal of the ordered concatenation of the first n odd numbers (case n=88). [Gupta]