A135606 Nearest-neighbors of perfect numbers.

5, 7, 27, 29, 495, 497, 8127, 8129, 33550335, 33550337, 8589869055, 8589869057, 137438691327, 137438691329, 2305843008139952127, 2305843008139952129, 2658455991569831744654692615953842175

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Crossrefs

Cf. A000396.

Sequence in context: A059240 A324363 A166100 * A051845 A278646 A029668

Adjacent sequences: A135603 A135604 A135605 * A135607 A135608 A135609

Keyword

easy,nonn

Author

Omar E. Pol, Nov 27 2007

Status

approved