A138872 Concatenation of first 3 digits and last 3 digits of n-th even superperfect number A061652(n).

22, 44, 1616, 6464, 409096, 655536, 262144, 107824, 115976, 309056, 811064, 850864, 343576, 265064, 520544, 737504, 223176, 129536, 953496, 142304, 239056, 173776, 140096, 215736, 224376, 201256, 427336, 268104, 260504, 256656, 373224, 870944

Offset: 1

Author

Omar E. Pol, Apr 02 2008

Keywords

• base
• nonn
• less

Comments

Also, concatenation of first 3 digits and last 3 digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Crossrefs

Cf. A019279, A061652, A138866, A138877, A138870, A138871.

Extensions

More terms from Max Alekseyev, Feb 11 2012