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A102237 Smallest number equal to the product of n primes which is also equal to the sum of n distinct primes. 0
2, 9, 12, 36, 48, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjecture: a(n) = 2^n for n>5. (Chandler)

LINKS

Table of n, a(n) for n=1..31.

EXAMPLE

a(1) = 2;

a(2) = 9 = 3*3 = 2+7;

a(3) = 12 = 2*2*3 = 2+3+7;

a(4) = 36 = 2*2*3*3 = 3+5+11+17;

a(5) = 48 = 2*2*2*2*3 = 2+3+5+7+31.

CROSSREFS

Sequence in context: A178312 A253608 A126977 * A324571 A076505 A218073

Adjacent sequences:  A102234 A102235 A102236 * A102238 A102239 A102240

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Feb 18 2005

EXTENSIONS

Corrected and extended by Ray Chandler Feb 25 2005

STATUS

approved

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Last modified October 14 16:40 EDT 2019. Contains 328022 sequences. (Running on oeis4.)