A073417 Flawless numbers: numbers without a, f, l or w.

1, 3, 6, 7, 8, 9, 10, 13, 16, 17, 18, 19, 30, 31, 33, 36, 37, 38, 39, 60, 61, 63, 66, 67, 68, 69, 70, 71, 73, 76, 77, 78, 79, 80, 81, 83, 86, 87, 88, 89, 90, 91, 93, 96, 97, 98, 99, 100, 101, 103, 106, 107, 108, 109, 110, 113, 116, 117, 118, 119, 130, 131, 133

Offset

1,2

Comments

1 and 6 seems to be the only numbers that are both flawless and perfect. 7 is the first odd number that is flawless but not perfect.

References

M. J. Halm, Sequences (Re)discovered, Mpossibilities 81 (Aug. 2002).

Links

Table of n, a(n) for n=1..63.

Example

a(3) = 6 because 6 is the third integer without an a, f, l or w.

Crossrefs

Sequence in context: A073850 A048748 A030781 * A299493 A047559 A288742

Adjacent sequences: A073414 A073415 A073416 * A073418 A073419 A073420

Keyword

easy,nonn,word

Author

Michael Joseph Halm, Aug 23 2002

Extensions

Corrected by T. D. Noe, Nov 01 2006

Missing 60 inserted by Sean A. Irvine, Nov 28 2024

Status

approved