1,1

Table of n, a(n) for n=1..15.

a(1) = 4 = A001358(1) is the first semiprime.

a(2) = 10 = A001358(1)+A001358(2) = 4+6 = A001358(4) = 10.

a(3) = 39 = 6 + 9 + 10 + 14 = 10 + 14 + 15 = 39.

a(4) = 185 = 58 + ... + 65 = 39 + ... + 51 = 4 + ... + 33 = 185.

Cf. A001358, A112020, A186336.

Sequence in context: A302183 A149203 A038168 * A100307 A238721 A077811

Adjacent sequences: A186334 A186335 A186336 * A186338 A186339 A186340

nonn,more

Alois P. Heinz, Feb 18 2011

a(11)-a(15) from Donovan Johnson, Feb 21 2011

approved