1,1

There are no more terms for m <= 34936. - Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 29 2007

Table of n, a(n) for n=1..6.

M. Kamada, Factorizations of near-repdigit numbers

a(1)= because 3*10^1-1 = 29 and 3*10^1+1 = 31 are primes.

a(2)= because 6*10^1-1 = 59 and 6*10^1+1 = 61 are primes.

a(3)= because 6*10^2-1 = 599 and 6*10^2+1 = 601 are primes.

a(4)= because 3*10^3-1 = 2999 and 3*10^3+1 = 3001 are primes.

a(5)= because 9*10^3-1 = 8999 and 9*10^3+1 = 9001 are primes.

a(6)= because 3*10^7-1 = 29999999 and 3*10^7+1 = 30000001 are primes.

Sequence in context: A078948 A269263 A042676 * A042678 A042680 A286005

Adjacent sequences: A124640 A124641 A124642 * A124644 A124645 A124646

more,nonn

Lekraj Beedassy, Dec 21 2006

Edited by N. J. A. Sloane, Jan 01 2007

approved