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A119603 Merging prime factors of n-th composite number. 2
22, 23, 222, 33, 25, 223, 27, 35, 2222, 233, 225, 37, 211, 2223, 55, 213, 333, 227, 235, 22222, 311, 217, 57, 2233, 219, 313, 2225, 237, 2211, 335, 223, 22223, 77, 255, 317, 2213, 2333, 511, 2227, 319, 229, 2235, 231, 337, 222222, 513, 2311, 2217, 323, 257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Rule "replace n-th composite number by concatenation of its prime factors" in A037271; composite numbers A002808.

LINKS

Table of n, a(n) for n=1..50.

EXAMPLE

a(6)=223 because 6th composite number is

12: A002808(6)=12, then 12=2*2*3 and merging prime

factors we get a(6)=223.

MATHEMATICA

Sow[FromDigits@Flatten[Table[IntegerDigits[ #[[1]]], {#[[2]]}]&/@FactorInteger@(n)]]], {n, 2, 115}]][[2, 1]]

CROSSREFS

Cf. A002808, A037271.

Sequence in context: A041998 A042000 A042002 * A042004 A042006 A042008

Adjacent sequences:  A119600 A119601 A119602 * A119604 A119605 A119606

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Jun 03 2006

STATUS

approved

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Last modified November 20 18:16 EST 2019. Contains 329337 sequences. (Running on oeis4.)