[go: up one dir, main page]

login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A085925
a(n) is taken to be the smallest positive integer greater than a(n-1) which is consistent with the condition "n is a member of the sequence if and only if a(n) is not prime".
2
1, 3, 4, 6, 7, 8, 9, 10, 12, 14, 17, 18, 19, 20, 23, 29, 30, 32, 33, 34, 37, 41, 42, 43, 47, 53, 59, 61, 62, 63, 67, 68, 69, 70, 71, 73, 74, 79, 83, 89, 90, 91, 92, 97, 101, 103, 104, 107, 109, 113, 127, 131, 132, 137, 139, 149, 151, 157, 158, 163, 164, 165, 166, 167, 173
OFFSET
1,2
EXAMPLE
a(4) = 6 because 4 is in the sequence and 6 is the next nonprime after a(3). a(5) = 7 because 5 is not in the sequence and 7 is the next prime after a(4).
CROSSREFS
Sequence in context: A375740 A122409 A039093 * A107907 A080804 A164386
KEYWORD
easy,nonn,less
AUTHOR
David Wasserman, Aug 16 2003
STATUS
approved