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A171653 First positional base with the first n of {21, 321, 4321,...} prime. 0
3, 14, 14, 4578, 367434, 367434, 6844073124, 35143773390 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The 5th/6th term may be considered as II0I in base 27, analogizing with the hexadecimal system. The 4th term is 2112 in base 13, (42)(42) in base 103, and AI in base 456. (In base-ten terms.)

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A319456 A222713 A138959 * A055435 A242868 A070418

Adjacent sequences:  A171650 A171651 A171652 * A171654 A171655 A171656

KEYWORD

nonn,base

AUTHOR

James G. Merickel, Dec 14 2009

EXTENSIONS

Seventh term added by James G. Merickel, Feb 03 2010

Eighth term added by James G. Merickel, Feb 12 2010

STATUS

approved

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Last modified September 17 17:57 EDT 2021. Contains 347489 sequences. (Running on oeis4.)