1,2

The sequence is infinite. To extend it from the first N terms, one seeks a constellation of composite numbers, of the right parity, whose span is no greater than the sum of the first N terms, S(N). There are infinitely many sequences, of consecutive composite numbers, of length S(N)+1 (indeed, any particular length); and each of those contains a sequence of length S(N) with the right parity. One of those must suffice and that puts an upper-bound on the N+1'st term. - Don Reble, Oct 02 2002

Sean A. Irvine, Table of n, a(n) for n = 1..1000

Sequence in context: A309628 A303716 A309629 * A317706 A302677 A304267

Adjacent sequences: A075570 A075571 A075572 * A075574 A075575 A075576

Amarnath Murthy, Sep 25 2002

More terms from Don Reble, Oct 02 2002

Offset corrected by Sean A. Irvine, Feb 26 2025

approved