A138820 Concatenation of n-th even superperfect number, n-th Mersenne prime A000668(n) and n-th perfect number.

236, 4728, 1631496, 641278128, 4096819133550336, 655361310718589869056, 262144524287137438691328, 107374182421474836472305843008139952128, 115292150460684697623058430092136939512658455991569831744654692615953842176

Offset: 1

Author

Omar E. Pol, Apr 05 2008

Keywords

• base
• nonn

Comments

Concatenation of A061652(n), A000668(n) and A000396(n).

Also concatenation of n-th superperfect number, n-th Mersenne prime A000668(n) and n-th perfect number, if there are no odd superperfect numbers.

Crossrefs

Cf. A000396, A000668, A019279, A061652, A138818, A138819.