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A248009 Partition of the positive odd integers into minimal blocks such that the concatenation of the numbers in each block is an evil number (A001969). Sequence lists the evil numbers obtained in this way. 4
135, 7911, 131517, 19212325272931, 33, 35373941, 43, 45, 4749, 51, 53, 5557, 596163, 65, 676971, 737577, 798183, 85, 8789, 9193, 95, 9799101103105, 107109, 111, 113, 115117119, 121123125127129, 131133, 135, 137139, 141, 143145147, 149, 151153155157, 159 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The numbers of the consecutive positive odd integers in the blocks of the partition are 3,3,3,7,1,4,1,1,2,1,1,2,3,1,3,3,3,1,2,2,...
LINKS
EXAMPLE
a(1)=135, since 1 and 13 are odious numbers, while 135 is evil.
PROG
(PARI) lista(nn) = {s = ""; forstep(n=1, nn, 2, ns = concat(s, Str(n)); if ((hammingweight(eval(ns)) % 2) == 0, print1(ns, ", "); s = "", s = ns); ); } \\ Michel Marcus, Oct 09 2014
CROSSREFS
Sequence in context: A212608 A212611 A004005 * A143404 A051028 A076011
KEYWORD
nonn,base
AUTHOR
Vladimir Shevelev, Oct 05 2014
EXTENSIONS
More terms from Peter J. C. Moses, Oct 09 2014
STATUS
approved

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Last modified September 21 19:30 EDT 2023. Contains 365503 sequences. (Running on oeis4.)