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A138843
Concatenation of initial and final digits of n-th perfect number.
9
66, 28, 46, 88, 36, 86, 18, 28, 26, 16, 18, 18, 26, 18, 58, 18, 96, 36, 16, 48, 16, 56, 36, 96, 16, 86, 36, 18, 18, 16, 28, 18, 86, 88, 36, 16, 86, 96, 46
OFFSET
1,1
COMMENTS
Also, concatenation of A135617(n) and A094540(n).
EXAMPLE
a(5)=36 because the 5th perfect number A000396(5) is 33550336 and the concatenation of initial and final digits of 33550336 is 36.
KEYWORD
base,nonn,less
AUTHOR
Omar E. Pol, Apr 02 2008
STATUS
approved