A114027 Composite numbers such that the n-th partial concatenation is a multiple of composite(n).

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

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