A096843 Primes of form repdigit - 1. Primes whose sum of divisors is a decimal repdigit.

2, 3, 5, 7, 43, 443, 887, 2221, 8887, 444443, 888887, 444444443, 888888887, 444444444443, 888888888887, 222222222222222221, 444444444444444444444444444443, 44444444444444444444444444444443

Offset: 1

Author

Labos Elemer, Jul 15 2004

Keywords

• nonn
• base

Comments

Union numbers 2, 5 and sequences A093171, A093163 and A091189.

Corresponding values of sigma(a(n)) are in A028987. - Jaroslav Krizek, Mar 19 2013

Examples

			n=43: sigma(43)=44;
		

Links

• Giovanni Resta, Table of n, a(n) for n = 1..33 (terms < 10^1000)

Crossrefs

Cf. A096503-A096508, A096841-A096846, A000203.

Extensions

Missing a(1)=2 and a(3)=5 added by Jaroslav Krizek, Mar 19 2013