EntityQ947015· pop 22· linked from 270 articlesEuler numberSign in to saveinteger sequence defined by the Taylor series expansion of the hyperbolic secant function and also appearing in that of the secant functionConnectionsprime numberEntityhyperbolic functionEntityfigurate numberEntityautomorphic numberEntitymathematicsEntityLeonhard EulerEntitynatural numberEntityintegerEntitydigital object identifierEntitydigitEntitybinary numeral systemEntityexponentiationEntitynumeral systemEntityEuler's numberEntitytrigonometric functionEntitycombinatoricsEntitysequenceEntitythree-dimensional spaceEntitydeterminantEntitynatural languageEntityCategoriesInteger sequencesLeonhard Euler