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A032747 Super-7 Numbers (7 x n^7 contains substring '7777777' in its decimal expansion). 1
140997, 490996, 1184321, 1259609, 1409970, 1783166, 1886654, 1977538, 2457756, 2714763, 2750425, 2980991, 3043607, 3283057, 3689639, 4191601, 4258476, 4642725, 4909960, 4973029, 5242829, 5349973, 5444788, 5523544, 5682065 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

C. A. Pickover, "Keys to Infinity", New York: Wiley, p. 7, 1995.

LINKS

Table of n, a(n) for n=0..24.

Eric Weisstein's World of Mathematics, Super-d Number.

MATHEMATICA

Select[Range[6*10^6], MemberQ[Partition[IntegerDigits[7#^7], 7, 1], {7, 7, 7, 7, 7, 7, 7}]&] (* Harvey P. Dale, Sep 01 2014 *)

CROSSREFS

Cf. A014569.

Sequence in context: A250570 A252017 A203833 * A212373 A195438 A164527

Adjacent sequences:  A032744 A032745 A032746 * A032748 A032749 A032750

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified August 12 00:34 EDT 2022. Contains 356067 sequences. (Running on oeis4.)