A055435 - OEIS

A055435

(1/18)*Difference between concatenation of n and n^2 and concatenation of n^2 and n.

0, -1, -3, 14, 15, 15, 14, 12, 9, 5, -55, -126, -208, -301, -405, -520, -646, -783, -931, -1090, -1260, -1441, -1633, -1836, -2050, -2275, -2511, -2758, -3016, -3285, -3565, 12144, 12342, 12529, 12705, 12870, 13024, 13167, 13299, 13420

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OFFSET

1,3

LINKS

Table of n, a(n) for n=1..40.

FORMULA

a(n) = (A053061(n) - A055436(n))/18 = n*(10^floor(2*log_10(W2)+1) - 1 - n*(10^floor(log_10(W2)+1)-1))/18.

MATHEMATICA

Table[((n*10^IntegerLength[x = n^2] + x) - (n^2*10^IntegerLength[n] + n))/18, {n, 40}] (* Jayanta Basu, Jul 12 2013 *)

CROSSREFS

Sequence in context: A222713 A138959 A171653 * A242868 A070418 A178363

Adjacent sequences: A055432 A055433 A055434 * A055436 A055437 A055438

KEYWORD

base,easy,sign

AUTHOR

Henry Bottomley, May 18 2000

STATUS

approved