A064161 Least abundant number divisible by the n-th prime number.

12, 12, 20, 42, 66, 78, 102, 114, 138, 174, 186, 222, 246, 258, 282, 318, 354, 366, 402, 426, 438, 474, 498, 534, 582, 606, 618, 642, 654, 678, 762, 786, 822, 834, 894, 906, 942, 978, 1002, 1038, 1074, 1086, 1146, 1158, 1182, 1194, 1266, 1338, 1362, 1374

Offset

1,1

Links

Table of n, a(n) for n=1..50.

Formula

a(n) = 6*prime(n) for n>=4. - Jose Brox (tautocrona(AT)terra.es), Mar 24 2003

Example

The first eight abundant numbers are 12, 18, 20, 24, 30, 36, 40 and 42. But only the last one is divisible by 7, the fourth prime number. Therefore a(4) = 42.

Mathematica

If[n==2||n==3, 4, 6]Prime[n]

Crossrefs

Sequence in context: A056627 A334620 A061074 * A260528 A260526 A040133

Adjacent sequences: A064158 A064159 A064160 * A064162 A064163 A064164

Keyword

easy,nonn

Author

Robert G. Wilson v, Sep 15 2001

Status

approved