Initial terms of chains consisting of four consecutive integers, for none of which is the value of sigma-function divisible by six.

A097020

Initial terms of chains consisting of four consecutive integers, for none of which is the value of sigma-function divisible by six.

Terms

    a(0) =1a(1) =241a(2) =576a(3) =721a(4) =1249a(5) =2449a(6) =12481a(7) =23761a(8) =40897a(9) =65521a(10) =120049a(11) =126001a(12) =128016a(13) =167041a(14) =186049a(15) =211248a(16) =211249a(17) =344449a(18) =374976a(19) =406801a(20) =417697a(21) =451249a(22) =607201a(23) =647521a(24) =665856a(25) =708049a(26) =746641a(27) =766321a(28) =1039681a(29) =1068721

External references