login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A097616 Values of n such that the first decimal digits of {2^n, ..., 9^n} form a prime number when concatenated. 1
1, 11, 21, 44, 55, 81, 90, 118, 126, 134, 147, 152, 171, 178, 184, 199, 262, 273, 279, 300, 326, 345, 346, 361, 365, 389, 394, 415, 418, 433, 436, 440, 448, 453, 455, 498, 525, 534, 541, 547, 563, 578, 586, 591, 609, 610, 623, 632, 643, 644, 651, 655, 658 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..53.

Eric Weisstein's World of Mathematics, Gelfand's Question

J. Eising, D. Radcliffe, and J. Top. A Simple Answer to Gelfand’s Question. American Mathematical Monthly 122:3 (2015), 234-245.

CROSSREFS

Cf. A097617.

Sequence in context: A064832 A129638 A127624 * A146150 A244069 A058489

Adjacent sequences:  A097613 A097614 A097615 * A097617 A097618 A097619

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein, Aug 16 2004

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 10 00:24 EST 2016. Contains 278993 sequences.