A090291 Index of first occurrence of n in A090290, or 0 if n does not occur in A090290.

1, 2, 5, 9, 35, 62, 195, 126, 186, 28, 230, 57, 26, 170, 280, 270, 265, 1008, 56, 398, 473, 376, 32, 581, 3204, 903, 898, 206, 1581, 2330, 2012, 370, 1512, 2119, 1548, 345, 646, 3481, 241, 1871, 2763, 995, 2304, 460, 633, 2338, 3801, 5138, 4472, 973, 4117, 2286

Offset

1,2

Comments

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

Links

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

Example

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.

Crossrefs

Cf. A090289, A090290.

Sequence in context: A366505 A359386 A151952 * A161137 A229551 A247550

Adjacent sequences: A090288 A090289 A090290 * A090292 A090293 A090294

Keyword

base,nonn

Author

Amarnath Murthy, Nov 29 2003

Extensions

More terms from David Wasserman, Oct 27 2005

Status

approved