2*a(n) is the start of 3 consecutive numbers (even-odd-even) that are sums of divisors, i.e., terms of A000203.
A342555
2*a(n) is the start of 3 consecutive numbers (even-odd-even) that are sums of divisors, i.e., terms of A000203.
Terms
- a(0) =3a(1) =6a(2) =15a(3) =19a(4) =63a(5) =153a(6) =199a(7) =255a(8) =423a(9) =480a(10) =511a(11) =546a(12) =861a(13) =1111a(14) =1189a(15) =1400a(16) =1770a(17) =1875a(18) =1935a(19) =1995a(20) =2047a(21) =2556a(22) =3475a(23) =3619a(24) =4005a(25) =4095a(26) =4920a(27) =5151a(28) =5215a(29) =6649
External references
- oeis: A342555