A065842 a(1) = 1; a(2) = 2; a(3) = 3; a(n) is concatenation of a(n-3), a(n-2) and a(n-1); the digits on the right of the first 3 (if any) are then swapped with the digits on the left.

1, 2, 3, 123, 12323, 123123233, 12323123123233123, 2312312323312323123123233123123, 123233123231231232331232312312323312323123123233123123123

Offset

1,2

References

C. A. Pickover, "Wonders of Numbers", Oxford University Press, 2001, chapter 122 '3 Weird Problems with 3 - Cleavage', pp. 272-274, 378.

Links

Table of n, a(n) for n=1..9.

C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review

Crossrefs

Cf. A065841, A001590.

Sequence in context: A208247 A102697 A041813 * A065841 A051177 A371271

Adjacent sequences: A065839 A065840 A065841 * A065843 A065844 A065845

Keyword

nonn,base

Author

Patrick De Geest, Nov 27 2001

Extensions

Offset and a(7) onward corrected by Sean A. Irvine, Sep 16 2023

Status

approved