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A068801 Primes that can be formed by concatenating 2^a and 3^b. 0
11, 13, 19, 23, 29, 41, 43, 83, 89, 127, 163, 181, 227, 281, 641, 643, 827, 881, 1283, 1289, 1627, 2243, 2729, 4243, 4729, 6427, 6481, 8243, 10243, 16561, 16729, 20483, 26561, 40961, 42187, 81929, 86561, 102481, 163841, 166561, 219683, 326561 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

8243 is a concatenation of 2^3 and 3^5. 10242187 is a term as a concatenation of 1024 (=2^10) and 2187(=3^7).

CROSSREFS

Cf. A068712, A068714.

Sequence in context: A330696 A103803 A188677 * A215504 A342406 A109650

Adjacent sequences:  A068798 A068799 A068800 * A068802 A068803 A068804

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Mar 05 2002

EXTENSIONS

Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jun 25 2002

STATUS

approved

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Last modified May 13 17:46 EDT 2021. Contains 343864 sequences. (Running on oeis4.)