A138843 Concatenation of initial and final digits of n-th perfect number.

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

Author

Omar E. Pol, Apr 02 2008

Keywords

• base
• nonn
• less

Comments

Also, concatenation of A135617(n) and A094540(n).

Examples

			a(5)=36 because the 5th perfect number A000396(5) is 33550336 and the concatenation of initial and final digits of 33550336 is 36.
		

Crossrefs

Cf. A000396, A073729, A135617, A094540, A138840, A138841, A138842, A138844.