A155775 Indices j in A000040 such that j is an odd composite and the distinct digits of the prime A000040(j) are in increasing order.

9, 15, 33, 35, 39, 55, 57, 69, 75, 77, 91, 203, 205, 207, 209, 219, 237, 247, 249, 355, 365, 391, 405, 483, 633, 749, 1475, 1501, 1515, 1595, 1605, 1615, 1631, 2611, 2637, 2829, 11603, 11803, 13479, 20797, 20891, 95375

Offset: 1

Author

Juri-Stepan Gerasimov, Jan 27 2009

Keywords

• nonn
• base

Comments

These are the odd composites n (A071904) such that the digits of prime(n) are strictly increasing. The latter defines a subsequence of A028864, which lists primes with nondecreasing digits. - R. J. Mathar, Jan 30 2009

Examples

			If odd number=n=9 and prime(9)=23, then 2<3 and 9=a(1). If odd number=n=15 and prime(15)=47, then 4<7 and 15=a(2). If odd number=n=33 and prime(33)=137, then 1<3<7 and 33=a(3), etc.
		

Crossrefs

Cf. A000040, A002808, A155079.

Extensions

Corrected and extended by R. J. Mathar, Jan 30 2009

Better definition from Omar E. Pol, Jan 31 2009