A347350 Sequence obtained by writing the first 4 integers and skipping 1, then writing the next 5 integers and skipping 2, then writing the next 6 and skipping 3, etc.

1, 2, 3, 4, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 22, 23, 24, 25, 26, 27, 28, 33, 34, 35, 36, 37, 38, 39, 40, 46, 47, 48, 49, 50, 51, 52, 53, 54, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 97, 98, 99, 100, 101, 102, 103, 104, 105

Offset: 1

Author

Michel Marcus, Aug 28 2021

Keywords

• nonn

Links

• Ana Rechtman, Août 2021, 4e défi, Images des Mathématiques, CNRS, 2021.
• Index entries for sequences generated by sieves

Crossrefs

Cf. A004201, A004202, A048859.

Programs

PARI

lista(nn) = {my(va=[1..nn], list=List()); my(i=4, j=1, pos=1, ok=1); while (ok, for(m=1, i, if (pos > nn, ok=0, listput(list, va[pos])); pos++; ); pos += j; i++; j++;); Vec(list);}