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1,2
a(p) = 2^p - 1 for prime p
Table of n, a(n) for n=1..30.
a(4) = 12, because 12 is the smallest number with a binary run length product of 4.
12 decimal = 1100 binary. Run lengths in binary are 2,2, and 2x2 = 4.
Cf. A167489 - Product of run length in binary representation of n
Cf. A167491 - Numbers in this sequence sorted in ascending order
Sequence in context: A193297 A240738 A047068 * A081533 A096856 A108154
Adjacent sequences: A167487 A167488 A167489 * A167491 A167492 A167493
nonn
Andrew Weimholt, Nov 05 2009
approved