A073475 Rearrangement of factorial numbers such that a(k) + a(k+1) - 1 is a prime for all k.

1, 2, 6, 24, 720, 120

Offset

1,2

Comments

The sequence is full because the next term would be divisible by 7 (the other factorials are already used), but 120+7x-1 is divisible by 7 and so cannot be a prime. - Sascha Kurz, Feb 01 2003

Links

Table of n, a(n) for n=1..6.

Crossrefs

Cf. A000142.

Sequence in context: A324141 A277423 A191460 * A061774 A110729 A088258

Adjacent sequences: A073472 A073473 A073474 * A073476 A073477 A073478

Keyword

fini,full,nonn

Author

Jason Earls, Aug 26 2002

Status

approved