A138832 Concatenation of n-th Mersenne prime A000668(n) and n-th perfect number.

36, 728, 31496, 1278128, 819133550336, 1310718589869056, 524287137438691328, 21474836472305843008139952128, 23058430092136939512658455991569831744654692615953842176

Offset

1,1

Links

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

Example

a(3)=31496 because A000668(3)=31 and A000396(3)=496.

Crossrefs

Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138833.

Sequence in context: A220758 A054339 A232131 * A223998 A109405 A064541

Adjacent sequences: A138829 A138830 A138831 * A138833 A138834 A138835

Keyword

base,nonn

Author

Omar E. Pol, Apr 06 2008

Status

approved