OFFSET
1,6
FORMULA
Partial sums of A036384. - Sean A. Irvine, Oct 29 2020
EXAMPLE
Below 32 the only odd split number is 21, so a(5) = 1. (In this range there are also 11 primes, 7 true prime powers, 1 composite connected number (15) and 4 even split numbers.)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(9) onward corrected and a(21)-a(32) from Sean A. Irvine, Oct 29 2020
STATUS
approved