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A077431 n repeated in decimal representation, but separated by enough zeros that the square has the pattern (n^2)(2n^2)(n^2). 3
11, 22, 303, 404, 505, 606, 707, 8008, 9009, 10010, 11011, 12012, 13013, 14014, 15015, 16016, 17017, 18018, 19019, 20020, 21021, 22022, 230023, 240024, 250025, 260026, 270027, 280028, 290029, 300030, 310031, 320032, 330033, 340034, 350035 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

A077433(n) = number of separating zeros.

FORMULA

n*(1+10^(1+floor(Log10(2*n^2)))).

EXAMPLE

a(17) = 17017, as 17017^2 = 289578289 = A077432(17) = 289'578'289 and 289=17^2 and 578=2*289.

CROSSREFS

Cf. A020338, A004216, A077430.

Sequence in context: A083511 A067894 A094620 * A118133 A155973 A180481

Adjacent sequences:  A077428 A077429 A077430 * A077432 A077433 A077434

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 05 2002

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Last modified February 14 14:47 EST 2012. Contains 205623 sequences.