[seqfan] See A007427 and A231122

юрий герасимов 2stepan at rambler.ru
Sun Mar 20 13:14:43 CET 2016

Dear SeqFans.                                                                                                                                      
See A231122 and comment (and formula) of A007427.                                                                                                                                                         
Abs(A007427(n)) is the number of unitary divisors u|n such that n/u is also unitary divisor of n?                       
New comment of A007427 or new sequence for OEIS ?                                                                                                             
Thanks. JSG.

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