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

1,1

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

Links

Table of n, a(n) for n=1..42.

Example

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.

Sequence in context: A108637 A091296 A107076 * A228096 A111148 A125216

Adjacent sequences: A155772 A155773 A155774 * A155776 A155777 A155778

Keyword

nonn,base

Author

Juri-Stepan Gerasimov, Jan 27 2009

Extensions

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

Better definition from Omar E. Pol, Jan 31 2009

Status

approved