A061244 Prime numbers with odd digits in ascending order.
3, 5, 7, 11, 13, 17, 19, 37, 59, 79, 113, 137, 139, 157, 179, 199, 337, 359, 379, 557, 577, 599, 1117, 1399, 1559, 1579, 1777, 1999, 3359, 3557, 3559, 3779, 5557, 5779, 11113, 11117, 11119, 11159, 11177, 11399, 11579, 11777, 11779, 13337, 13339
Offset: 1
Examples
37 is a term since 3 and 7 are odd digits and 3 < 7.
Links
- Robert Israel, Table of n, a(n) for n = 1..10000
Programs
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Maple
A061244:= {}: for d from 1 to 20 do for n1 from 0 to d do x1:= (10^n1-1)/9; for n3 from 0 to d-n1 do x3:= x1*10^n3 + (10^n3-1)/9*3; for n5 from 0 to d-n1-n3 do x5:= x3*10^n5 + (10^n5-1)/9*5; for n7 from 0 to d-n1-n3-n5 do x7:= x5*10^n7 + (10^n7-1)/9*7; n9:= d-n1-n3-n5-n7; x:= x7*10^n9 + (10^n9-1); if isprime(x) then A061244:= A061244 union {x}; fi od od od od od: A061244; # Robert Israel, Apr 20 2014
Extensions
More terms from Patrick De Geest, Jun 04 2001