1,2

10^(n) -prime(a(n)) is a prime and least such prime. Conjecture: No term is zero.

Table of n, a(n) for n=1..52.

a(3) = 9, 10^3-prime(i) is not a prime for i = 1 to 8. prime(9) = 23, 10^3 - 23= 977 is a prime.

Cf. A090289, A090290.

Sequence in context: A105456 A128565 A151952 * A161137 A229551 A247550

Adjacent sequences: A090288 A090289 A090290 * A090292 A090293 A090294

base,nonn

Amarnath Murthy, Nov 29 2003

More terms from David Wasserman, Oct 27 2005

approved