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A020574
Smallest nonempty set S containing prime divisors of k + 10 for each k in S.
0
3, 7, 11, 13, 17, 23
OFFSET
1,1
EXAMPLE
3 + 10 = 13, which is in the set.
7 + 10 = 17, which is in the set.
11 + 10 = 21 = 3 * 7, both of which are in the set.
13 + 10 = 23, which is in the set.
17 + 10 = 27 = 3^3, and 3 is in the set.
23 + 10 = 33 = 3 * 11, both of which are in the set.
CROSSREFS
Sequence in context: A310194 A310195 A310196 * A020618 A184865 A055211
KEYWORD
nonn,fini,full
STATUS
approved