Heptagonal Pyramidal Number

A heptagonal pyramidal number is the sum of the first few heptagonal numbers. The heptagonal number for n can be calculated by adding up the heptagonal numbers for 1 to n, or by using the formula n(n + 1)(5n - 2)/6.

The first few heptagonal pyramidal numbers are:

1, 8, 26, 60, 115, 196, 308, 456, 645, 880, 1166, 1508, 1911, 2380, 2920, 3536, 4233, 5016, 5890, 6860, 7931, 9108 (sequence A002413 in OEIS)

Other articles related to "pyramidal":

Pyramidal Cell
... Pyramidal neurons (pyramidal cells) are a type of neuron found in areas of the brain including cerebral cortex, the hippocampus, and in the amygdala ... Pyramidal neurons are the primary excitation units of the mammalian prefrontal cortex and the corticospinal tract ... Pyramidal neurons were first discovered and studied by Santiago Ramón y Cajal ...
Square Pyramidal Molecular Geometry - Examples
... Some molecular compounds that adopt square pyramidal geometry are XeOF4, and XF5 (X = Cl, Br, I) also have square pyramidal geometries ... Complexes of vanadium(IV), such as are square pyramidal (acac = acetylacetonate, the anion of 2,4-pentanedione that has lost a proton) ...
Subiculum - Paths
... It receives input from CA1 and entorhinal cortical layer III pyramidal neurons and is the main output of the hippocampus ... The pyramidal neurons send projections to the nucleus accumbens, septal nuclei, prefrontal cortex, lateral hypothalamus, nucleus reuniens, mammillary nuclei, entorhinal cortex and amygdala ... The pyramidal neurons in the subiculum exhibit transitions between two modes of action potential output bursting and single spiking ...
Pyramidal Process Of Palatine Bone
... The pyramidal process of the palatine bone projects backward and lateralward from the junction of the horizontal and vertical parts, and is received into the angular interval ... On the base of the pyramidal process, close to its union with the horizontal part, are the lesser palatine foramina for the transmission of the posterior and middle ...

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