A108511 a(n) is the smallest number m such that prime(m) = n*m - 1, or 0 if no such m exists.

0, 2, 1, 0, 70, 182, 440, 1053, 0, 6458, 0, 40087, 0, 251737, 637320, 1617173, 4124466, 10553445, 27067100, 69709705, 179992910, 465769811, 0, 3140421738, 8179002128, 21338685403, 0, 0, 382465573528, 0, 0, 6935812012545, 18262325820324, 0, 0, 335276334036937

Offset: 1

Author

Farideh Firoozbakht, Jun 12 2005

Keywords

• nonn

Comments

A108512(n) gives number of solutions of the equation prime(x) = n*x - 1.

Examples

			a(26) = 21338685403 because prime(21338685403) = 26*21338685403 - 1 and 21338685403 is the smallest (only) number m with this property.
		

Crossrefs

Cf. A108512, A108514.

Extensions

a(29)-a(33) from Donovan Johnson, Nov 15 2009

a(34)-a(36) from Jinyuan Wang, Aug 09 2021