A060088 Palindromic squares with an asymmetric square root.

1230127210321, 12120030703002121, 12341234943214321, 102210100272001012201, 102230523292325032201, 121020021070120020121, 121240161292161042121, 123230205292502032321, 1020300010207020100030201

Offset

1,1

Comments

With 'asymmetric' is meant almost palindromic with a 'core' (pseudo-palindromic). The core '09' when transformed into '1n' (n=-1) makes the base number palindromic. E.g., 1109111 is in fact 11_09_111 -> 11_(10-1)_111 -> 11_1n_111 -> 111n111 and palindromic. Similarly core 099 becomes 10n, core 0999 becomes 100n, etc.

References

M. Keith, "Classification and Enumeration of Palindromic Squares," Journal of Recreational Mathematics, 22:2, pp. 124-132, 1990.

Links

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

P. De Geest, Subsets of Palindromic Squares

Crossrefs

Cf. A060087, A007573, A059744, A059745.

Sequence in context: A234065 A271447 A361723 * A359346 A077300 A083407

Adjacent sequences: A060085 A060086 A060087 * A060089 A060090 A060091

Keyword

nonn,base

Author

Patrick De Geest, Feb 15 2001

Status

approved