1,1

a(n) = {floor(e^k) = p*q for integer k, p and q prime}. a(n) = A000149 INTERSECTION A001358.

a(1) = 403 = floor(e^6) = 13 * 31.

a(2) = 3269017 = floor(e^15) = 773 * 4229.

a(3) = 485165195 = floor(e^20) = 5 * 97033039.

a(4) = 3584912846 = floor(e^22) = 2 * 1792456423.

a(5) = 26489122129 = floor(e^24) = 103 * 257175943.

Cf. A000040, A000149, A001358, A074496.

Sequence in context: A097740 A083815 A097741 this_sequence A135791 A132362 A063138

Adjacent sequences: A117833 A117834 A117835 this_sequence A117837 A117838 A117839

easy,nonn

Jonathan Vos Post (jvospost2(AT)yahoo.com), Apr 30 2006