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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. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A097003 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

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Last modified September 21 19:39 EDT 2019. Contains 327279 sequences. (Running on oeis4.)