

A050945


Six consecutive integers with decreasing values of sigma start at these numbers: sigma(x) > sigma(x+1) > sigma(x+2) > sigma(x+3) > sigma(x+4) > sigma(x+5).


1



20021154, 28503474, 53728674, 224539314, 242917674, 304178874, 341295954, 370845474, 377692314, 443998554, 533007474, 610484874, 709445274, 855529674, 964885074, 978052074, 1069943874, 1114988874, 1167961794
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OFFSET

1,1


COMMENTS

There are many examples of 4 consecutive numbers having decreasing values of sigma (see cross references) and there are 83 cases of 6 consecutive numbers with decreasing values of sigma < 4,293,000,000. Interestingly (and for unknown reasons) there are no examples of exactly 5 such consecutive numbers in that range! All known members of the sequence are multiples of 6 and one less than a multiple of 35.


REFERENCES

David Wells, The Penguin Dictionary of Curious and Interesting Numbers, entry 44.


LINKS

Table of n, a(n) for n=1..19.


EXAMPLE

sigma(20021154)=40894848 > sigma(20021155)=35458560 > ... > sigma(20021159)=20021160


CROSSREFS

Cf. A000203, A050944.
Sequence in context: A251513 A103123 A107618 * A251458 A116497 A133543
Adjacent sequences: A050942 A050943 A050944 * A050946 A050947 A050948


KEYWORD

nonn


AUTHOR

Jud McCranie, Jan 02 2000


STATUS

approved



