A055436 - OEIS

A055436

a(n) = concatenation of n^2 and n.

11, 42, 93, 164, 255, 366, 497, 648, 819, 10010, 12111, 14412, 16913, 19614, 22515, 25616, 28917, 32418, 36119, 40020, 44121, 48422, 52923, 57624, 62525, 67626, 72927, 78428, 84129, 90030, 96131, 102432, 108933, 115634, 122535, 129636, 136937, 144438, 152139

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

FORMULA

a(n) = n^2*floor(log_10(n) + 1) + n.

a(n) = A055437(n) if 1 <= n < 10, a(n) = A055438(n) if 10 <= n < 100.

MAPLE

a:= n-> parse(cat(n*n, n)):

seq(a(n), n=1..100); # Alois P. Heinz, Jan 03 2015

MATHEMATICA