A202266 Composite numbers in which all substrings and reversal substrings are composites.

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

Author

Jaroslav Krizek, Dec 25 2011

Keywords

• nonn
• base

Comments

Subsequence of A202265, A202262.

Examples

			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).