The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A154534 Odd nonprimes n with smallest digit of n + number of smallest digits of n = odd nonprime. 1
 77, 105, 201, 203, 205, 207, 209, 301, 303, 305, 309, 403, 405, 407, 501, 505, 507, 603, 605, 609, 703, 705, 707, 779, 801, 803, 805, 807, 899, 901, 903, 905, 909, 989, 1011, 1015, 1017, 1023, 1025, 1027, 1029, 1035, 1037, 1041, 1043, 1045, 1047, 1053, 1055 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..1000 EXAMPLE If n=77=odd nonprime, 7=7 and 7+2=9=odd nonprime, thus 77 is in the sequence.  If n=105=odd nonprime, 0<1<5 and 0+1=1=odd nonprime, thus 105 is in the sequence. MAPLE filter:= proc(n) local L, m, q;   if isprime(n) then return false fi;   L:= convert(n, base, 10);   m:= min(L);   q:= m + numboccur(L, m);   q::odd and not isprime(q) end proc: select(filter, [seq(2*i+1, i=0..1000)]); # Robert Israel, Apr 15 2015 CROSSREFS Cf. A141468. Sequence in context: A247682 A127335 A193570 * A235867 A274967 A229826 Adjacent sequences:  A154531 A154532 A154533 * A154535 A154536 A154537 KEYWORD nonn,base AUTHOR Juri-Stepan Gerasimov, Jan 11 2009 EXTENSIONS Edited by Alois P. Heinz, Apr 15 2015 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.

Last modified August 7 17:38 EDT 2020. Contains 336278 sequences. (Running on oeis4.)