Numbers m that divide the alternating sum Sum_{k=1..m} (-1)^(k+1) * usigma(k).

Terms

a(0) =1a(1) =2a(2) =9a(3) =54a(4) =101a(5) =178a(6) =189a(7) =2071a(8) =3070a(9) =9171a(10) =11450a(11) =12794a(12) =21405a(13) =27553a(14) =35285a(15) =251974a(16) =2069863a(17) =2395894a(18) =155931488a(19) =387586437a(20) =758519827a(21) =1202435693a(22) =9859113494a(23) =42703260442