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

Author

Bob Selcoe, Jan 04 2015

Keywords

• nonn
• easy

Examples

			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.

Extensions

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