

A114027


Composite numbers such that the nth partial concatenation is a multiple of composite(n).


1



4, 8, 8, 16, 10, 8, 6, 15, 20, 4, 20, 16, 12, 24, 25, 12, 8, 28, 20, 16, 44, 38, 35, 44, 16, 32, 40, 8, 32, 25, 26, 4, 35, 50, 35, 24, 6, 25, 52, 58, 56, 40, 38, 82, 24, 55, 68, 4, 68, 60, 72, 66, 75, 28, 78, 38, 40, 125, 16, 44, 90, 34, 20, 24, 60, 78, 36, 12
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..68.


EXAMPLE

A002808(2)=6 divides 48, A002808(3)=8 divides 488, A002808(4)=9 divides 48816 etc.  R. J. Mathar, Aug 31 2007


PROG

(PARI) lista(nn) = {my(m, s=""); forcomposite(k=4, nn, m=4; while(eval(Str(s, m))%k  isprime(m), m++); print1(m, ", "); s=Str(s, m)); } \\ Jinyuan Wang, May 30 2020


CROSSREFS

Cf. A002808, A114028.
Sequence in context: A255992 A273572 A273779 * A005877 A144174 A256816
Adjacent sequences: A114024 A114025 A114026 * A114028 A114029 A114030


KEYWORD

nonn,base


AUTHOR

Amarnath Murthy, Nov 13 2005


EXTENSIONS

Corrected and extended by R. J. Mathar, Aug 31 2007
More terms from Jinyuan Wang, May 30 2020


STATUS

approved



