A055726 Number of lucky 2,6 triples <= 10^n.

1, 2, 5, 16, 52, 243, 1374, 8503, 55537

Offset

0,2

Comments

A lucky 2,6 triple is a triple (k, k+2, k+6) such that k, k+2, and k+6 are lucky numbers and no other number between k and k+6 is lucky. - Sean A. Irvine, Apr 04 2022

A triple is counted in a(n) if its smallest member is at most 10^n. - Pontus von Brömssen, Apr 04 2022

Links

Table of n, a(n) for n=0..8.

Crossrefs

Cf. A000959.

Sequence in context: A291685 A268571 A001428 * A101500 A339828 A047063

Adjacent sequences: A055723 A055724 A055725 * A055727 A055728 A055729

Keyword

nonn,less,more

Author

Robert G. Wilson v, Jun 09 2000

Extensions

a(7) from Sean A. Irvine, Apr 04 2022

a(8) from Pontus von Brömssen, Apr 04 2022

Status

approved