A172069 The number of primes adjacent to A129912(n): 0, 1 or 2.

1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 0, 1, 1, 0, 0, 0, 1, 2, 0, 2, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 2, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 2, 0, 0

Offset: 1

Author

Bill McEachen, Jan 24 2010

Keywords

• easy
• nonn

Examples

			Both 415799 and 415801 are prime, so the entry at 415800 (n=27) is a 2 (twin primes).
Neither 27719 nor 27721 are prime, so the entry at 27720 (n=18) is a 0.
		

Links

• Bill McEachen, Table of n, a(n) for n = 1..282

Crossrefs

Cf. A129912.

Extensions

Offset corrected and sequence extended by R. J. Mathar, Feb 19 2010

a(1) added by T. D. Noe, Nov 11 2013