Numbers m such that DivisorSigma(4*k-2, m) mod m = 0 holds presumably for all k; that is, (4k-2)-power-sums of divisors of m are divisible by m for all k.
A066290
Numbers m such that DivisorSigma(4*k-2, m) mod m = 0 holds presumably for all k; that is, (4k-2)-power-sums of divisors of m are divisible by m for all k.
Terms
- a(0) =1a(1) =10a(2) =60a(3) =65a(4) =130a(5) =150a(6) =260a(7) =780a(8) =1105a(9) =2210a(10) =4420a(11) =8840a(12) =13260a(13) =19720a(14) =20737a(15) =32045a(16) =41474a(17) =55250a(18) =64090a(19) =82948a(20) =103685a(21) =128180a(22) =207370a(23) =207553a(24) =221000a(25) =248844a(26) =256360a(27) =295800a(28) =331500a(29) =352529
External references
- oeis: A066290