A086711 Primes p such that A001414(p-1) = A001414(p+1), where A001414 = sum of primes dividing n (with repetition).

11, 17, 31, 251, 1429, 3041, 16561, 16927, 53299, 56897, 89783, 95089, 213599, 282977, 345547, 432587, 592223, 763457, 906949, 915799, 1050449, 1058389, 1485017, 1577341, 1678399, 1780253, 1855549, 2131687, 2374289, 2658259

Offset: 1

Author

Jason Earls, Jul 28 2003

Keywords

• nonn

Comments

Conjecture: sequence is infinite.

Examples

			a(3)=31 because it is prime and 30=2*3*5, 32=2^5 and 2+3+5 = 2+2+2+2+2 = 10.
		

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..1280

Crossrefs

Cf. A001414, A190680.