A152246 Composites c where |c-m| = 1, where m is any of the smallest positive integers with their number of divisors. (m belongs to sequence A007416.)

15, 25, 35, 49, 63, 65, 119, 121, 143, 145, 361, 575, 721, 841, 899, 901, 959, 961, 1023, 1025, 1261, 1295, 1679, 1681, 2519, 2881, 3071, 3073, 3599, 3601, 4095, 4097, 5041, 5183, 5185, 6479, 6721, 9215, 9217, 10081, 12287, 14399, 15119, 20159, 25199

Offset

1,1

Links

Table of n, a(n) for n=1..45.

Example

The smallest positive integer with 8 divisors is 24. 24 - 1 = 23 is prime. But 24 + 1 = 25 is composite. So 25 is in the sequence, while 23 is not.

Crossrefs

A007416, A152245

Sequence in context: A200046 A349750 A171133 * A069823 A133321 A031888

Adjacent sequences: A152243 A152244 A152245 * A152247 A152248 A152249

Keyword

nonn

Author

Leroy Quet, Nov 30 2008

Extensions

Extended by Ray Chandler, Dec 05 2008

Status

approved