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

1,1

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.

Links

Table of n, a(n) for n=1..9.

Crossrefs

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

Sequence in context: A251484 A247475 A233166 * A218649 A285156 A242148

Adjacent sequences: A138817 A138818 A138819 * A138821 A138822 A138823

Keyword

base,nonn

Author

Omar E. Pol, Apr 05 2008

Status

approved