A205404 Least s(k) such that n divides s(k)-s(j) for some j < k, where s(j) = floor((j+1)^2/2)/2.

2, 4, 4, 6, 6, 12, 9, 9, 20, 12, 12, 16, 25, 16, 16, 20, 36, 20, 20, 36, 25, 42, 25, 25, 56, 30, 36, 30, 30, 36, 56, 36, 42, 36, 36, 42, 49, 42, 64, 42, 42, 72, 49, 56, 49, 110, 49, 49, 100, 56, 81, 56, 110, 56, 56, 72, 121, 64, 169, 64, 81, 64, 64, 100, 81, 72

Offset

1,1

Comments

For a guide to related sequences, see A204892.

Links

Table of n, a(n) for n=1..66.

Mathematica

(See the program at A205402.)

Crossrefs

Cf. A205402, A204892.

Sequence in context: A135974 A153494 A352749 * A322372 A330812 A368200

Adjacent sequences: A205401 A205402 A205403 * A205405 A205406 A205407

Keyword

nonn

Author

Clark Kimberling, Jan 27 2012

Extensions

Definition corrected by Clark Kimberling, Dec 05 2021

Status

approved