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A055724 Number of lucky twins <= 10^n. 0
1, 2, 7, 33, 178, 1162, 7669, 55548, 419174, 3274570, 26298112 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

W. Schneider, Lucky Numbers

CROSSREFS

Cf. A000959.

Sequence in context: A080119 A162257 A214954 * A054727 A086618 A224769

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

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Last modified March 27 12:35 EDT 2017. Contains 284176 sequences.