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Bell number
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==Bell primes== {{harvnb|Gardner|1978}} raised the question of whether infinitely many Bell numbers are also [[prime number]]s. These are called '''Bell primes'''. The first few Bell primes are: :2, 5, 877, 27644437, 35742549198872617291353508656626642567, 359334085968622831041960188598043661065388726959079837 {{OEIS|id=A051131}} corresponding to the indices 2, 3, 7, 13, 42 and 55 {{OEIS|id=A051130}}. The next '''Bell prime''' is ''B''<sub>2841</sub>, which is approximately 9.30740105 × 10<sup>6538</sup>.<ref>{{cite OEIS|A051131}}</ref>
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