login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A247948 Five-digit odd semiprimes with all digits distinct. 1
10237, 10239, 10249, 10265, 10279, 10297, 10327, 10345, 10347, 10349, 10367, 10379, 10389, 10397, 10423, 10435, 10473, 10483, 10489, 10493, 10495, 10497, 10523, 10537, 10543, 10547, 10573, 10579, 10583, 10587, 10623, 10637, 10643, 10645, 10649 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There are exactly 4858 five-digit odd semiprimes with all digits distinct. The last few terms of the sequence are: 98501, 98503, 98517, 98521, 98531, 98537, 98567, 98603, 98607, 98617, 98635, 98647, 98653, 98657, 98671, 98701, 98723, 98741, 98743, 98751, 98765.

See the link with the b-file for all 4858 entries.

LINKS

K. D. Bajpai, Table of n, a(n) for n = 1..4858

EXAMPLE

a(1) = 10237 = 29 * 353 is the smallest five-digit odd semiprime with all digits distinct.

a(4858) = 98765 = 5 * 19753 is the largest five-digit odd semiprime with all digits distinct.

MATHEMATICA

c = 0; Do[If[Length[Union[IntegerDigits[n]]] == 5 && PrimeOmega[n] == 2, c++; Print[c, "  ", n]], {n, 10001, 99999, 2}]

CROSSREFS

Cf. A001358, A046315, A074671, A074673, A235690, A247947.

Sequence in context: A236743 A031987 A235693 * A254563 A074671 A235157

Adjacent sequences:  A247945 A247946 A247947 * A247949 A247950 A247951

KEYWORD

nonn,base,fini,full

AUTHOR

K. D. Bajpai, Sep 27 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 25 10:44 EDT 2019. Contains 326324 sequences. (Running on oeis4.)