A072712 Primes p such that p divides the (right) concatenation of all numbers from 1 to p written in base 10 (most significant digit on left).

2, 3, 5, 8167, 371321

Offset: 1

Author

Jeff Heleen, Aug 07 2002

Keywords

• base
• more
• nonn

Comments

Right concatenation, normal order.

Primes in A029455. - Derek Orr, Oct 04 2014

Examples

			p=17 is not a term since 1234567891011121314151617 is not divisible by 17.
		

Links

• Carlos Rivera, Puzzle 190. A follow up for the puzzle 188, The Prime Puzzles & Problems Connection.

Crossrefs

Cf. A029447-A029542, A061931-A061978.

Programs

PARI

p=""; n=1; while(n<10^4, p=concat(p,Str(n)); if(eval(p)%n==0&&isprime(n), print1(n,", ")); n++) \\ Derek Orr, Oct 04 2014

Extensions

Another term from Jeff Heleen, Oct 11 2009