Duplication Rant

[Hans Havermann]

I recently extended A071259 (Amarnath Murthy, May 30 2002). When, 
subsequently, I tried to refind that sequence based on some terms, I 
noticed that there was a duplicate (A073434, Labos E., Jul 31 2002). I 
readily understand how this happened. When only 4 or 5 terms are 
submitted per sequence, any subsequent submitter of the same sequence 
is not likely to find it in the database. To be fair, my extension 
should be credited to Labos E. and the duplicate removed.

It can get worse. Suppose I wanted to submit a sequence of adjacent 
identicals in A008472:

{5, 24, 49, 77, 104, 153, 369, 492, 714, 1682, 2107, 2299, 2600, 2783, 
5405, 6556, 6811, 8855, 9800, 12726, 13775, 18655, 21183, 24024, 24432, 
24880, 25839, 26642, 35456, 40081, 43680, 48203, 48762, 52554, 61760, 
63665, 64232, 75140, 79118, 95709, 106893, 109939, 112079, 118656, 
132209, 141340, 143622, 148215, 154842, 155111, 173162, 180359, 189080, 
197657, 204258, 208581, 215391, 224104, 228599, 231284, 235586, 244595, 
244853, 248109, 263628, 268656, 268715, 278277, 289316, 294335, 296751, 
319428, 332994, 333801, 350599, 370348, 373703, 380963, 384312, 388450, 
404973, 407835, 416119, 417162, 421819, 430604, 445305, 461824, 466773, 
467302, 501830, 529194, 537916, 547525, 554682, 557535, 560150, 563390, 
564924, ...}

Already in the database? I don't see it, so I'll submit... Hehe. It's 
there. Twice! A075655 (%S A075655 5,49,77,96) & A075656 (%S A075656 
6,50,78,97). I think we can dispense with "%C A075655 Is this sequence 
infinite?"