A253593 a(n) is the largest of the first n terms in A098550 for which the numbers 1 to a(n) are a subset, pretending all primes present.

1, 2, 3, 4, 4, 4, 4, 4, 5, 9, 9, 9, 9, 9, 9, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 22, 22, 28, 28, 28, 28, 28, 28, 36, 36, 39, 39, 39, 39, 39, 39, 39, 45, 45, 45, 45, 45, 45, 45, 45, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52

Offset

1,2

Links

Table of n, a(n) for n=1..67.

Example

a(9) = 5 because the first 9 terms in A098550 are {1, 2, 3, 4, 9, 8, 15, 14, 5}, and {1, 2, 3, 4, 5} is a subset.
a(10) = 9 because the first 10 terms in A098550 are {1, 2, 3, 4, 9, 8, 15, 14, 5, 6}; and pretending that prime 7 is present, {1, 2, 3, 4, 5, 6, 7, 8, 9} is a subset.

Crossrefs

Cf. A098550, A253591.

Sequence in context: A029117 A308547 A195850 * A174901 A308411 A087848

Adjacent sequences: A253590 A253591 A253592 * A253594 A253595 A253596

Keyword

nonn,easy

Author

Bob Selcoe, Jan 04 2015

Extensions

Name improved and 2 terms corrected by Hans Havermann, Jan 06 2015

Status

approved