A120763 a(1) = 2. a(n) = a(n-1)*(largest prime occurring earlier in the sequence) - 1.

2, 3, 8, 23, 528, 12143, 147452448, 1790515076063, 21742224568633008, 264015832936910616143, 3205944259352905611824448, 38929781141322332844384272063, 472724332399077087729358215661008

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Example

Among the first 4 terms of the sequence, 23 is the largest prime. So a(5) = a(4)*23 -1 = 23*23 -1 = 528.

Prog

(PARI) {m=13; print1(a=2, ", "); v=[a]; for(n=2, m, b=a; v=vecsort(v); j=#v; a=0; while(a<1, k=v[j]; if(isprime(k), print1(a=b*k-1, ", "); v=concat(v, a), j--)))} - (Klaus Brockhaus, Aug 17 2006)

Crossrefs

Cf. A120762.

Sequence in context: A365118 A032096 A301462 * A120708 A327009 A271269

Adjacent sequences: A120760 A120761 A120762 * A120764 A120765 A120766

Keyword

nonn

Author

Leroy Quet, Jul 03 2006

Extensions

More terms from Klaus Brockhaus, Aug 17 2006

Status

approved