A034991 Smallest square starting with a string of n 7's.

729, 7744, 777924, 77774761, 77777400996, 777777594889, 77777777127241, 77777777127241, 7777777771566496516, 7777777777144230025, 777777777770200337601, 777777777777430543201344, 77777777777778331004281924, 77777777777777489970787004164, 7777777777777771308012741325056, 777777777777777744351960257494201, 7777777777777777716034080781138596

Offset

1,1

References

David Wells, 'Curious and Interesting Numbers', Penguin Books 1988, p. 184.

Links

Table of n, a(n) for n=1..17.

Crossrefs

Cf. A034990.

Sequence in context: A217969 A017379 A067477 * A017499 A269057 A017631

Adjacent sequences: A034988 A034989 A034990 * A034992 A034993 A034994

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 1998

Extensions

More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 23 2001

Status

approved