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A062238 Composite numbers which contain their largest proper factor as a substring. 13
15, 25, 125, 1537, 3977, 11371, 38117, 110317, 117197, 123679, 143323, 146137, 179297, 197513, 316619, 390913, 397139, 399797, 485357, 779917, 797191, 990919, 1110691, 1178951, 1483117, 1723717, 1813733, 2165299, 2273099, 2369777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

3{97}7 = 97*41

MATHEMATICA

Do[ If[ !PrimeQ[ n ] && StringPosition[ ToString[ n ], ToString[ Divisors[ n ] [ [ -2 ] ] ] ] != {}, Print[ n ] ], {n, 2, 10^7} ]

CROSSREFS

Sequence in context: A020300 A032587 A336689 * A146249 A248834 A249109

Adjacent sequences:  A062235 A062236 A062237 * A062239 A062240 A062241

KEYWORD

base,nonn

AUTHOR

Erich Friedman, Jun 30 2001

EXTENSIONS

More terms from Robert G. Wilson v, Aug 08 2001

STATUS

approved

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Last modified November 29 23:37 EST 2020. Contains 338780 sequences. (Running on oeis4.)