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A007573 Number of asymmetric families of palindromic squares.
(Formerly M1319)
4
1, 2, 5, 6, 9, 10, 10, 15, 15, 16, 18, 24, 18, 26, 24, 30, 27, 33, 28, 40, 33, 40, 35, 48, 37, 50, 42, 53, 45 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

REFERENCES

M. Keith, Classification and enumeration of palindromic squares, J. Rec. Math., 22 (No. 2, 1990), 124-132.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=7..35.

P. De Geest, Subsets of Palindromic Squares

M. Keith, Classification and enumeration of palindromic squares, J. Rec. Math., 22 (No. 2, 1990), 124-132. [Annotated scanned copy]. See foot of page 130.

G. J. Simmons, On palindromic squares of non-palindromic numbers, J. Rec. Math., 5 (No. 1, 1972), 11-19. [Annotated scanned copy]

EXAMPLE

Second term a(9)=2 indicates existence of two length 9 base numbers, 110091011 and 111091111.

CROSSREFS

Cf. A002778, A002779.

Sequence in context: A136369 A269472 A244272 * A285663 A143909 A284507

Adjacent sequences:  A007570 A007571 A007572 * A007574 A007575 A007576

KEYWORD

nonn,base,changed

AUTHOR

Simon Plouffe, N. J. A. Sloane, Robert G. Wilson v

EXTENSIONS

a(21)-a(35) from Sean A. Irvine, Jan 10 2018

STATUS

approved

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Last modified January 24 04:31 EST 2018. Contains 298115 sequences.