A034817 Concatenations C1 and C2 and C3 are all prime (see the comment lines).

63, 333, 621, 3339, 4557, 8127, 13977, 16827, 18177, 21921, 27393, 34989, 40023, 40047, 46917, 59727, 61203, 79467, 94767, 95079, 100821, 102771, 104859, 106527, 113883, 114123, 143433, 147123, 156201, 158409, 160149, 196737, 209277, 209961

Offset: 0

Author

Patrick De Geest, Oct 15 1998

Keywords

• nonn
• base

Comments

C1 = 'prevprime(n) followed by n'

C2 = 'n followed by nextprime(n)'

C3 = 'prevprime(n) followed by n followed by nextprime(n)'

Examples

			n=95079 -> previous prime is 95071, next prime is 95083, thus '9501795079' and '9507995083' and '950719507995083' are all three primes.
		

Crossrefs

Cf. A034808-A034821.