OFFSET
1,2
COMMENTS
The sequence has only 12 terms beyond a(1) = 1 as there is no number k such that k - 4467 = sopfr(k) + sopfr(4467). See A369349 for the number of terms beyond each starting value n.
MAPLE
a(3) = 20 as a(2) = 6 and sopfr(20) + sopfr(6) = 9 + 5 = 14, which equals 20 - 6.
a(13) = 4467 as a(12) = 2867 and sopfr(4467) + sopfr(2867) = 1492 + 108 = 1600, which equals 4467 - 2867.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Scott R. Shannon, Jan 21 2024
STATUS
approved