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A089331 a(1) = 1; for n>1, a(n) = smallest power of 2 not included earlier such that the (n>1) concatenation a(n), a(n-1), ...a(2), a(1) is a prime. 0
1, 4, 2, 4096, 8, 16, 524288, 18446744073709551616, 3064991081731777716716694054300618367237478244367204352, 268435456, 14474011154664524427946373126085988481658748083205070504932198000989141204992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

41,241,4096241, etc. are primes.

CROSSREFS

Sequence in context: A016518 A118202 A277578 * A125856 A057110 A073275

Adjacent sequences: A089328 A089329 A089330 * A089332 A089333 A089334

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 04 2003

EXTENSIONS

More terms from David Wasserman, Sep 13 2005

STATUS

approved

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Last modified January 30 19:34 EST 2023. Contains 359947 sequences. (Running on oeis4.)