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A182272 Starting with 1, smallest integer not yet in the sequence such that two neighboring digits in the sequence multiply to a composite. 1
1, 4, 2, 3, 5, 6, 7, 8, 9, 10, 14, 16, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 72, 73, 74, 75, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For this sequence, 0 is considered composite.

LINKS

Table of n, a(n) for n=1..67.

CROSSREFS

Sequence in context: A247206 A228047 A188543 * A182273 A166016 A213196

Adjacent sequences:  A182269 A182270 A182271 * A182273 A182274 A182275

KEYWORD

nonn,base

AUTHOR

Jim Nastos and Eric Angelini, Apr 22 2012

STATUS

approved

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Last modified October 17 16:51 EDT 2019. Contains 328120 sequences. (Running on oeis4.)