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A202266
Composite numbers in which all substrings and reversal substrings are composites.
3
4, 6, 8, 9, 44, 46, 48, 49, 64, 66, 68, 69, 84, 86, 88, 94, 96, 99, 444, 446, 448, 464, 466, 468, 469, 484, 486, 488, 494, 496, 644, 646, 648, 649, 664, 666, 668, 669, 684, 686, 688, 694, 696, 699, 844, 846, 848, 849, 864, 866, 868, 869, 884, 886, 888, 946, 948
OFFSET
1,1
COMMENTS
Subsequence of A202265, A202262.
EXAMPLE
All substrings and reversal substrings of 446 are composites: 4, 6, 44, 46, 64, 446, 644.
CROSSREFS
Cf. A202263 (primes in which all substrings and reversal substrings are primes), A202264 (noncomposite numbers in which all substrings and reversal substrings are noncomposite), A202265 (nonprimes in which all substrings and reversal substrings are nonprimes).
Sequence in context: A113591 A029581 A202262 * A232541 A076612 A182775
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Dec 25 2011
STATUS
approved