OFFSET
1,2
COMMENTS
Following numbers also belongs to this sequence, however their actual positions are unknown: 3640527948039840, 181552482521182080, 19736989888296320640, 108455561012908979640, 796015410768776072160, 4220107447484548287360, 39697147230528075361920, 202868762331595335655680, 668431747385354202124160, 124402428235930297906738935, 2456687209744634987008753664.
LINKS
Tim Trudgian, The sum of the unitary divisor function, arXiv:1312.4615 [math.NT], 2013-2014 (see page 6).
Tim Trudgian, The sum of the unitary divisor function, Publications de l'Institut Mathématique (Beograd), Vol. 97(111), 2015.
EXAMPLE
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Michel Marcus, Jan 29 2014
EXTENSIONS
More terms from Andrew Lelechenko, Feb 06 2014
STATUS
approved