OFFSET
1,1
LINKS
Scott R. Shannon, Table of n, a(n) for n = 1..10000
EXAMPLE
22 is a term as there is no number p such that p - 22 = sopfr(p + 22) and there is no number q such that q - 22 = sopfr(q + 22).
4 is not a term as 12 - 4 = 8 and sopfr(12 + 4) = sopfr(16) = 8. Therefore 12 is not a term either.
CROSSREFS
KEYWORD
nonn
AUTHOR
Scott R. Shannon, Jan 25 2024
STATUS
approved