/**
 * Converts decimal numbers starting at 1 to bijective base-26 uppercase letter strings
 * @param {number} input natural number
 * @returns {string} Bijective base-26 upper case letter string conversion of input number
 * @example decimalTobb26(1) //A
 * @example decimalTobb26(497) //SC
 */
export default function decimalTobb26(input: number): string;
/**
 * performs recursive operation
 *@param {number} input natural number greater than 0
 *@param {string} sum summation variable default empty string
 *@returns {number} returns upper case letter string bijective base-26 value
 */
export declare function rdecimalTobb26(input: number, sum?: string): string;
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