A088261 Smallest number prefixed with corresponding term of the sequence of numbers == 1, 3, 7 or 9 (mod 10), i.e., (1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, ...) that yields a prime.

1, 1, 1, 1, 2, 1, 3, 4, 4, 2, 1, 2, 1, 2, 1, 1, 2, 4, 3, 1, 1, 3, 1, 3, 4, 1, 1, 2, 2, 1, 2, 1, 1, 2, 4, 3, 1, 1, 1, 1, 5, 1, 5, 1, 2, 2, 1, 3, 3, 1, 4, 1, 2, 4, 2, 4, 2, 2, 5, 11, 1, 1, 4, 4, 2, 1, 3, 3, 1, 6, 4, 2, 1, 13, 1, 5, 3, 1, 5, 6, 1, 2, 2, 3, 4, 1, 1, 4, 2, 1, 5, 1, 1, 5, 1, 2, 4, 2, 6, 1, 2, 3, 3, 1, 4

Offset

0,5

Links

Table of n, a(n) for n=0..104.

Example

The term corresponding to 61 is 4 as 161, 261 and 361 are composite.

Crossrefs

Sequence in context: A336926 A193788 A109447 * A248393 A033779 A033799

Adjacent sequences: A088258 A088259 A088260 * A088262 A088263 A088264

Keyword

base,easy,nonn

Author

Amarnath Murthy, Sep 28 2003

Extensions

More terms from David Wasserman, Jul 27 2005

Status

approved