A082280 a(1) = 1, then the smallest number such that there are a(n) composite numbers between a(n) and a(n+1) both excluded.

1, 5, 13, 31, 71, 160, 355, 777, 1681, 3603, 7677, 16272, 34323, 72119, 151036, 315355, 656823, 1364925, 2830706, 5859765, 12110519, 24991695, 51503762, 106008953, 217946295, 447610014

Offset

1,2

Links

Chai Wah Wu, Table of n, a(n) for n = 1..65

Mathematica

k = i = 1; Print[k]; Do[t = 0; While[t < k, i++; If[ !PrimeQ[i], t++ ]]; k = i = (i+1); Print[k], {n, 1, 25}] (* Ryan Propper, Jul 14 2005 *)

Crossrefs

Cf. A082278, A082279, A082281.

Sequence in context: A209009 A118646 A097969 * A007708 A146609 A121129

Adjacent sequences: A082277 A082278 A082279 * A082281 A082282 A082283

Keyword

nonn

Author

Amarnath Murthy, Apr 13 2003

Extensions

More terms from Ryan Propper, Jul 14 2005

Status

approved