Wieferich pairs and Barker sequences, II Peter Borwein and Michael J. Mossinghoff 65 known values of u < 5 * 10^49 for which u has exactly five prime factors, counting multiplicity, and n = 4u^2 cannot be eliminated as a possible length of a Barker sequence. Each value is shown with its prime factorization. 19417213258149231605065 [5, 17, 613, 1974353, 188748146801] 2988996856098832119836165 [5, 13, 123397, 1974353, 188748146801] 9452241740448373850913905 [5, 53, 97, 4794006457, 76704103313] 15404473387141196513735425 [5, 5, 5333, 612142549, 188748146801] 24575828525165772012376153 [13, 53, 97, 4794006457, 76704103313] 25981280364551386887806665 [5, 113, 123397, 1974353, 188748146801] 52375209516280068146700445 [5, 17, 5333, 612142549, 188748146801] 99021524150061321493690205 [5, 30109, 1128713, 2167849, 268813277] 140942697906814160727659165 [5, 613, 123397, 1974353, 188748146801] 257455962790159435883594533 [13, 30109, 1128713, 2167849, 268813277] 517444747360358132047705405 [5, 613, 453029, 1974353, 188748146801] 659766473483296494793790569 [53, 97, 349, 4794006457, 76704103313] 1226178479505774745775866765 [5, 5333, 123397, 1974353, 188748146801] 2232258803418579742515251705 [5, 613, 1954369, 1974353, 188748146801] 2583847262104496316799390285 [5, 3061, 453029, 1974353, 188748146801] 2928304491190906219013127769 [53, 97, 1549, 4794006457, 76704103313] 3750753411546760768966411405 [5, 613, 1974353, 3283829, 188748146801] 3822230832192367009656441913 [193, 30109, 1128713, 2167849, 268813277] 4501684890167683390229058605 [5, 5333, 453029, 1974353, 188748146801] 11685674551664310593362875565 [5, 3209, 1954369, 1974353, 188748146801] 19034268391909301427715332685 [5, 193, 1954369, 53471161, 188748146801] 19228899405573515033094594845 [5, 193, 1974353, 53471161, 188748146801] 19420287436592635834965476905 [5, 5333, 1954369, 1974353, 188748146801] 22115020739251280222341147805 [5, 6073, 1954369, 1974353, 188748146801] 23057798501649763171919379857 [53, 97, 12197, 4794006457, 76704103313] 30680086241147331845296352849 [53, 97, 16229, 4794006457, 76704103313] 32630942812037316771448404605 [5, 5333, 1974353, 3283829, 188748146801] 43915160188737097964561169085 [5, 24697, 16110317, 53471161, 412835053] 58577050501943113863130327105 [5, 5333, 19013, 612142549, 188748146801] 61074172723401889716512884145 [5, 613, 1974353, 53471161, 188748146801] 104161712055507524339789076445 [5, 123397, 453029, 1974353, 188748146801] 214936120320123104434203958973 [10853, 30109, 1128713, 2167849, 268813277] 316481695697600768298126956405 [5, 3209, 1954369, 53471161, 188748146801] 439376593360132698301319798665 [5, 71809, 1974353, 3283829, 188748146801] 449354061281309110093237381145 [5, 123397, 1954369, 1974353, 188748146801] 598938403855260039225467437285 [5, 6073, 1954369, 53471161, 188748146801] 755027273612782444711497990445 [5, 123397, 1974353, 3283829, 188748146801] 1395734634820637823084209170465 [5, 5333, 453029, 612142549, 188748146801] 2771941382185346630349240444365 [5, 453029, 1974353, 3283829, 188748146801] 4020741835543902521020255150345 [5, 193, 53471161, 412835053, 188748146801] 5023176620690365547485086799045 [5, 820957, 1974353, 3283829, 188748146801] 5509509432534111522497305666933 [53, 97, 2914393, 4794006457, 76704103313] 6021205049830750617870517764365 [5, 5333, 1954369, 612142549, 188748146801] 6082773649064476552096615511005 [5, 5333, 1974353, 612142549, 188748146801] 6357914609712647293673964468517 [30109, 321037, 1128713, 2167849, 268813277] 11958166711535450729664137832265 [5, 1954369, 1974353, 3283829, 188748146801] 18242743680725022958778424504185 [5, 24697, 53471161, 412835053, 6692367337] 65827993938168106025953150303745 [5, 5333, 1954369, 6692367337, 188748146801] 66501104610134531726945464322065 [5, 5333, 1974353, 6692367337, 188748146801] 111101638388371151008295444128445 [5, 5333, 53471161, 412835053, 188748146801] 164739015320808449703717124315685 [5, 5333, 53471161, 612142549, 188748146801] 194716916592597435242041711049885 [5, 1954369, 1974353, 53471161, 188748146801] 327173147700026270972082851270785 [5, 1974353, 3283829, 53471161, 188748146801] 514509124934858863013664463461505 [5, 24697, 53471161, 412835053, 188748146801] 5591972673132263061097230401079185 [5, 453029, 1954369, 6692367337, 188748146801] 5649152244594906576734741563165345 [5, 453029, 1974353, 6692367337, 188748146801] 9437889393858127539871943888630285 [5, 453029, 53471161, 412835053, 188748146801] 14325042042227225723042344920804505 [5, 453029, 5006537, 6692367337, 188748146801] 20618478907957899871124246025962645 [5, 5333, 612142549, 6692367337, 188748146801] 24370466400863306701042317675164045 [5, 1954369, 1974353, 6692367337, 188748146801] 40715094302539384591211580507381385 [5, 1954369, 53471161, 412835053, 188748146801] 40948482252164535755927919962359345 [5, 1974353, 3283829, 6692367337, 188748146801] 41131418161821816446030589724606745 [5, 1974353, 53471161, 412835053, 188748146801] 61798291259556410095416727407136805 [5, 1954369, 5006537, 6692367337, 188748146801] 62430197031972456041370028897543285 [5, 1974353, 5006537, 6692367337, 188748146801]