A161915 Digital root of Ramanujan primes (A104272).

2, 2, 8, 2, 5, 2, 5, 4, 8, 7, 2, 8, 1, 5, 7, 5, 8, 1, 2, 4, 8, 5, 7, 2, 8, 2, 1, 5, 5, 7, 7, 4, 5, 4, 5, 8, 1, 7, 2, 1, 5, 8, 2, 4, 2, 8, 5, 7, 4, 2, 4, 8, 5, 2, 2, 8, 7, 1, 4, 4, 8, 2, 4, 8, 7, 2, 8, 1, 5, 2, 4, 2, 1, 2, 4, 5, 5, 7, 8, 1, 7, 2, 8, 5, 8, 2, 8, 2, 5, 7, 8, 2, 1, 5, 8, 5, 1, 5, 7, 8, 7, 2, 5, 2, 4

Offset: 1

Author

Parthasarathy Nambi, Jun 22 2009

Keywords

• nonn
• base

Examples

			659 is a Ramanujan's prime whose digital root is 2.
		

Links

• Eric W. Weisstein, Ramanujan Prime

Crossrefs

A104272

Extensions

a(53) corrected by R. J. Mathar, Jul 08 2009