Positive triangular numbers such that the two numbers before it and the two numbers after it are squarefree.
A374503
Positive triangular numbers such that the two numbers before it and the two numbers after it are squarefree.
Terms
- a(0) =36a(1) =300a(2) =780a(3) =1596a(4) =2016a(5) =2556a(6) =2628a(7) =3240a(8) =3828a(9) =4560a(10) =5460a(11) =6216a(12) =7260a(13) =8256a(14) =9180a(15) =10296a(16) =10440a(17) =11628a(18) =12720a(19) =14196a(20) =16836a(21) =18336a(22) =18528a(23) =21528a(24) =23220a(25) =23436a(26) =25200a(27) =26796a(28) =28680a(29) =32640
External references
- oeis: A374503