A055724 Number of lucky twins <= 10^n.

1, 2, 7, 33, 178, 1162, 7669, 55548, 419174, 3274570, 26298112

Offset

0,2

Links

Table of n, a(n) for n=0..10.

W. Schneider, Lucky Numbers

Crossrefs

Cf. A000959.

Sequence in context: A366237 A369269 A369300 * A301433 A054727 A086618

Adjacent sequences: A055721 A055722 A055723 * A055725 A055726 A055727

Keyword

nonn

Author

Robert G. Wilson v, Jun 09 2000

Extensions

a(7),a(8),a(9) were calculated by Walter Schneider (wschnei(AT)t-online.de).

a(10) from Robert G. Wilson v, Aug 22 2015.

Status

approved