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A103123 1/4-Smith numbers. 2
19899699, 36969999, 36999699, 39699969, 39999399, 39999993, 66699699, 66798798, 67967799, 67987986, 69759897, 69889389, 69966699, 69996993, 76668999, 79488798, 79866798, 85994799, 86686886, 89769759, 89866568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

McDaniel, W.L., "The Existence of infinitely Many k- Smith numbers", Fibonacci Quarterly, 25(1987), pp. 76-80.

LINKS

Table of n, a(n) for n=1..21.

S.S.Gupta, Smith Numbers.

EXAMPLE

19899699 is a 4^(-1) Smith number because the digit sum of 19899699, i.e., S(19899699) = 1 + 9 + 8 + 9 + 9 + 6 + 9 + 9 = 60, which is equal to 4 times the sum of the digits of its prime factors, i.e., 4*Sp(19899699) = 4*Sp (3*2203*3011) = 4*(3 + 2 + 2 + 0 + 3 + 3 + 0 + 1 + 1) = 15.

CROSSREFS

Cf. A006753.

Sequence in context: A122557 A284101 A251513 * A107618 A050945 A251458

Adjacent sequences:  A103120 A103121 A103122 * A103124 A103125 A103126

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta, Mar 16 2005

STATUS

approved

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Last modified March 26 20:49 EDT 2017. Contains 284137 sequences.