



353942783, 1163385647, 1932319583, 2336924879, 4166809919, 4937621453, 5123340683, 5184740299, 5390865059, 5455982879, 5467766947, 6432033887, 6459553799, 6545574839, 6714582263, 6988649399, 7378517519, 7515851039, 7657182539, 7756383347
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OFFSET

1,1


COMMENTS

Counterexamples to the conjecture from section F26 in UPINT.
a(1) was found by Martin Fuller; a(2) was found by Janis Iraids.
The prime terms of each of the sequences A189123 and A189124.


REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, Section F26.


LINKS

Janis Iraids, Table of n, a(n) for n = 1..1000
Martin N. Fuller, C program for A005245


CROSSREFS

Cf. A005245, A189123, A189124.
Sequence in context: A167517 A227642 A189124 * A258610 A227933 A159300
Adjacent sequences: A189122 A189123 A189124 * A189126 A189127 A189128


KEYWORD

nonn,hard


AUTHOR

Max Alekseyev, Apr 17 2011


EXTENSIONS

More terms from Janis Iraids, Apr 20 2011.


STATUS

approved



