Do you consider yourself a value investor? For value ideas, we ran a screen you may be interested in.

We began by screening for large-cap stocks, with market caps above $10 billion, for those that appear undervalued to earnings growth, with PEG below 1. We then screened these names to find those that appear undervalued to the Graham Number.

The Graham Number was created by the "godfather of value investing" Benjamin Graham as a calculation for a stock's maximum fair value. It is based off of a stock's EPS and book value per share (BVPS).

Graham Number = SQRT(22.5 x TTM EPS x MRQ BVPS)

The equation assumes that P/E should not be higher than 15 and P/BV should not be higher than 1.5. Stocks trading well below their Graham Number may be undervalued.

*Interactive Chart: Press Play to compare changes in analyst ratings over the last two years for the top six stocks mentioned below. Analyst ratings sourced from Zacks Investment Research.*

We also created a price-weighted index of the stocks mentioned below, and monitored the performance of the list relative to the S&P 500 index over the last month. To access a complete analysis of this list's recent performance, click here.

Do you think these stocks should be trading higher? Use this list as a starting point for your own analysis.

** 1. Alcoa, Inc. (NYSE:AA):** Engages in the production and management of aluminum, fabricated aluminum, and alumina. PEG at 0.99. Diluted TTM earnings per share at 0.55, and a MRQ book value per share value at 12.96, implies a Graham Number fair value = sqrt(22.5*0.55*12.96) = $12.66. Based on the stock's price at $10.43, this implies a potential upside of 21.42% from current levels.

** 2. Aetna Inc. (NYSE:AET):** Operates as a diversified health care benefits company in the United States. PEG at 0.75. Diluted TTM earnings per share at 5.22, and a MRQ book value per share value at 29.06, implies a Graham Number fair value = sqrt(22.5*5.22*29.06) = $58.42. Based on the stock's price at $46.89, this implies a potential upside of 24.59% from current levels.

** 3. Ameriprise Financial Inc. (NYSE:AMP):** Provides financial planning, products, and services primarily in the United States. PEG at 0.96. Diluted TTM earnings per share at 4.37, and a MRQ book value per share value at 46.49, implies a Graham Number fair value = sqrt(22.5*4.37*46.49) = $67.61. Based on the stock's price at $56.41, this implies a potential upside of 19.85% from current levels.

** 4. Apache Corp. (NYSE:APA):** Operates as an independent energy company. PEG at 0.89. Diluted TTM earnings per share at 11.47, and a MRQ book value per share value at 75.5, implies a Graham Number fair value = sqrt(22.5*11.47*75.5) = $139.59. Based on the stock's price at $111.57, this implies a potential upside of 25.11% from current levels.

* 5. CIGNA Corporation (NYSE:CI):* Operates as a health service organization. PEG at 0.79. Diluted TTM earnings per share at 5.5, and a MRQ book value per share value at 28.71, implies a Graham Number fair value = sqrt(22.5*5.5*28.71) = $59.61. Based on the stock's price at $45.09, this implies a potential upside of 32.19% from current levels.

** 6. Discover Financial Services (NYSE:DFS):** Operates as a credit card issuer and electronic payment services company primarily in the United States. PEG at 0.8. Diluted TTM earnings per share at 4.06, and a MRQ book value per share value at 15.59, implies a Graham Number fair value = sqrt(22.5*4.06*15.59) = $37.74. Based on the stock's price at $30.19, this implies a potential upside of 25.% from current levels.

*BVPS and EPS data sourced from Yahoo! Finance, all other data sourced from Finviz.

**Disclosure: **I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours.