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A046270 Largest prime substring in 4^n (0 if none). 2
0, 0, 0, 0, 5, 2, 409, 163, 6553, 2621, 857, 419, 1677721, 71, 43, 107, 4294967, 171798691, 6871947673, 779069, 511627, 4398046511, 18604441, 703687441, 28147497671, 11258999, 59962737049, 180143985094819, 759403792793 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..28.

CROSSREFS

Cf. A046262.

Sequence in context: A266461 A068566 A212481 * A139207 A137237 A152419

Adjacent sequences:  A046267 A046268 A046269 * A046271 A046272 A046273

KEYWORD

nonn

AUTHOR

Patrick De Geest, Jun 15 1998

STATUS

approved

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Last modified January 23 22:16 EST 2020. Contains 331177 sequences. (Running on oeis4.)