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A202262 Composite numbers in which all substrings are composite. 5
4, 6, 8, 9, 44, 46, 48, 49, 64, 66, 68, 69, 84, 86, 88, 94, 96, 98, 99, 444, 446, 448, 464, 466, 468, 469, 484, 486, 488, 489, 494, 496, 498, 644, 646, 648, 649, 664, 666, 668, 669, 684, 686, 688, 689, 694, 696, 698, 699, 844, 846, 848, 849, 864, 866, 868 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A062115, A202260, A029581.

Supersequence of A202265.

This is a 10-automatic sequence, see A071062. - Charles R Greathouse IV, Jan 01 2012

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for 10-automatic sequences.

PROG

(Haskell)

a202262 n = a202262_list !! (n-1)

a202262_list = [4, 6, 8, 9] ++ [x | u <- a202262_list, v <- [4, 6, 8, 9],

                       let x = 10 * u + v, v /= 9 || a010051 x == 0]

-- Reinhard Zumkeller, May 05 2012

CROSSREFS

Cf. A085823 (primes in which all substrings are primes), A068669 (noncomposite numbers in which all substrings are noncomposite), A062115 (nonprimes in which all substrings are nonprimes).

Cf. A010051.

Sequence in context: A113624 A113591 A029581 * A202266 A232541 A076612

Adjacent sequences:  A202259 A202260 A202261 * A202263 A202264 A202265

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Dec 25 2011

EXTENSIONS

Data corrected by Reinhard Zumkeller, May 05 2012

STATUS

approved

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Last modified April 19 20:04 EDT 2019. Contains 322291 sequences. (Running on oeis4.)