A070295 Smallest composite number such that there are exactly n primes less than it (and coprime to it) which do not divide it, or 0 if no such number exists.

4, 10, 8, 14, 16, 20, 24, 25, 33, 32, 0, 44, 48, 49, 66, 62, 64, 72, 74, 80, 81, 91, 98, 105, 104, 108, 111, 115, 121, 128, 140, 141, 154, 152, 158, 164, 171, 169, 182, 183, 192, 194, 204, 200, 212, 224, 230, 232, 235, 246, 242, 243, 256, 265, 273, 272, 278, 285

Offset

1,1

Comments

Are there any zero values other than a(11) = 0?

Links

Table of n, a(n) for n=1..58.

Example

a(4) = 14: primes up to 14 are 2, 3, 5, 7, 11, 13 out of which four primes 3, 5, 11 and 13 are coprime to 14.

Crossrefs

Sequence in context: A080362 A365781 A298400 * A123483 A073722 A320577

Adjacent sequences: A070292 A070293 A070294 * A070296 A070297 A070298

Keyword

nonn

Author

Amarnath Murthy, May 10 2002

Extensions

Corrected and extended by Larry Reeves (larryr(AT)acm.org), Oct 01 2002

Status

approved