1,1

Conjecture: sequence is infinite.

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

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.

Cf. A001414, A190680.

Sequence in context: A127703 A165667 A339180 * A039514 A098797 A271999

Adjacent sequences: A086708 A086709 A086710 * A086712 A086713 A086714

nonn

Jason Earls, Jul 28 2003

approved