A088057 a(1)= 7, a(n) = least prime obtained by prefixing the digits of a multiple of n to a(n-1).

7, 47, 347, 12347, 5012347, 425012347, 7425012347, 1447425012347, 1891447425012347, 201891447425012347, 330201891447425012347, 36330201891447425012347, 24736330201891447425012347

Offset

1,1

Comments

Digits of a(n) can be partitioned from (least siginifacnt one) right to left into multiples of 1 to n. a(5) = 5012347 ===> 50, 12, 3, 4, 7.

Links

Table of n, a(n) for n=1..13.

Example

a(3) = 347 and a(4) = 12347 is obtained by prefixing 12 to 347.

Crossrefs

Cf. A088056.

Sequence in context: A104092 A024187 A001711 * A249477 A108434 A349255

Adjacent sequences: A088054 A088055 A088056 * A088058 A088059 A088060

Keyword

base,nonn

Author

Amarnath Murthy, Sep 21 2003

Extensions

More terms from Sam Alexander, Feb 27 2004

Status

approved