The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A068345 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A068345

Powers of 2, the fourth-from-last digit of which equals 7.
(history; published version)

#6 by Joerg Arndt at Mon Jun 24 02:33:32 EDT 2013

STATUS

proposed

approved

#5 by Michel Marcus at Sat Jun 22 07:57:15 EDT 2013

STATUS

editing

proposed

#4 by Michel Marcus at Sat Jun 22 04:14:44 EDT 2013

OFFSET

0,1,1

CROSSREFS

Cf. A066867.

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:51:44 EDT 2012

AUTHOR

_Harvey P. Dale (hpd1(AT)nyu.edu), _, Mar 06 2002

Discussion

Fri Mar 30

18:51

OEIS Server: https://oeis.org/edit/global/252

#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

MATHEMATICA

Select[NestList[2#&, 1024, 150], Take[IntegerDigits[ # ], {-4, -4}][[1]]==7&]

KEYWORD

nonn,base,new

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Powers of 2, the fourth-from-last digit of which equals 7.

DATA

2097152, 16777216, 134217728, 4294967296, 1099511627776, 70368744177664, 72057594037927936, 4611686018427387904, 9444732965739290427392, 38685626227668133590597632, 19807040628566084398385987584

OFFSET

0,1

REFERENCES

Sylvia Nasar, A Beautiful Mind (1998), p. 80.

MATHEMATICA

Select[NestList[2#&, 1024, 150], Take[IntegerDigits[ # ], {-4, -4}][[1]]==7&]

KEYWORD

nonn,base

AUTHOR

Harvey P. Dale (hpd1(AT)nyu.edu), Mar 06 2002

STATUS

approved