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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,changed

AUTHOR

Eric W. Weisstein, Aug 16 2004

STATUS

approved

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Last modified August 28 08:35 EDT 2015. Contains 261118 sequences.