

A051131


Prime Bell numbers (A000110).


2




OFFSET

1,1


REFERENCES

Bell, E. T. "Exponential Numbers." Amer. Math. Monthly 41, 411419, 1934.


LINKS

Table of n, a(n) for n=1..6.
Eric Weisstein's World of Mathematics, Bell Numbers
Eric Weisstein's World of Mathematics, Bell Number


EXAMPLE

Bell(2)=2 and Bell(3)=5 are primes, Bell(4)..Bell(6) are composite, Bell(7)=877 is prime.


CROSSREFS

Cf. A000110, A051130.
Sequence in context: A208212 A176117 A078748 * A119748 A101341 A079014
Adjacent sequences: A051128 A051129 A051130 * A051132 A051133 A051134


KEYWORD

nonn


AUTHOR

Ignacio Larrosa CaĆ±estro


EXTENSIONS

The next term is too large to include. See A051130.


STATUS

approved



