2,3

Table of n, a(n) for n=2..102.

a(4) = 3, f(4) = 4+2 = 6, f(6) = 6+3 = 9, f(9)= 9+4 = 13 is prime.

a(10) = 4, f(10) = 10+4=14, f(14) = 14+6 = 20, f(20) = 20+8 = 28, f(28) = 28+9 = 37.

Cf. A090545, A090546.

Sequence in context: A286443 A075522 A186144 * A283755 A038766 A080993

Adjacent sequences: A090541 A090542 A090543 * A090545 A090546 A090547

nonn

Amarnath Murthy, Dec 09 2003

More terms from Franklin T. Adams-Watters, Apr 26 2006

approved