SPSSs Order 53;

The first discoveries in this order were made by C.J. Bouwkamp in the 1990's, 53 : 218735A CJB, 53 : 218735B CJB.

In 1996 Ian Gambini found 2 small SPSS of order 53 : 824A I_G 1999, 53 : 1086A I_G 1999

In 2014 Brian Trial found 4992 order 53 SPSSs.

In 2018 Bernard Moss found 869 order 53 SPSSs using his transforms, applied to Brian Trial's 2014 discoveries.

In 2019-2020 Bernard Moss found 2 order 53 SPSSs with small sides, 53 : 1017 and 53 : 1211, then up to mid 2020 he found an additional 288 order 53 SPSSs.

There are 6155 known SPSSs of Order 53. Files provided as;

• text file spsso53.txt of tablecodes for download.
• text file spsso53.bkp of bouwkampcodes for download.
• pdf file spsso53.pdf for viewing and download.