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A046273 Largest prime substring in 7^n (0 if none). 2
0, 7, 0, 43, 401, 7, 7649, 823, 4801, 3607, 82475249, 7326743, 41287201, 89, 23072849, 7561, 232930569601, 2630513987207, 8413597910449, 398895185373143, 297612001, 558545864083, 2988049, 3400809163 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

CROSSREFS

Cf. A046265.

Sequence in context: A199917 A157779 A222322 * A167317 A024094 A157307

Adjacent sequences:  A046270 A046271 A046272 * A046274 A046275 A046276

KEYWORD

nonn

AUTHOR

Patrick De Geest, Jun 15 1998.

STATUS

approved

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Last modified May 22 21:43 EDT 2013. Contains 225583 sequences.