A138877 Concatenation of first 3 digits and last 3 digits of n-th perfect number.

66, 2828, 496496, 812128, 335336, 858056, 137328, 230128, 265176, 191216, 131128, 144128, 235976, 141128, 541328, 108528, 994776, 335056, 182536, 407528, 114216, 598576, 395336, 931656, 100376, 811816, 365456, 144528, 136528, 131016, 278128

Offset: 1

Author

Omar E. Pol, Apr 02 2008

Keywords

• base
• nonn

Links

• Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.
• Jan Munch Pedersen, Known Perfect Numbers [From Steven Bi (chenhsi(AT)stanford.edu), Jan 13 2009]

Crossrefs

Cf. A000396, A104511, A138843, A138866.

Extensions

Added terms 15-33 and corrected 1 term Steven Bi (chenhsi(AT)stanford.edu), Jan 13 2009