The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A156307 Primes where the first digit equals the sum of all the other digits. 3
 11, 101, 211, 431, 523, 541, 743, 761, 853, 2011, 4013, 4211, 5023, 5113, 7043, 7151, 7331, 8017, 8053, 8161, 8233, 8431, 8521, 20011, 20101, 21001, 40013, 40031, 41201, 42101, 50023, 50131, 50221, 50311, 51031, 52021, 52201, 53101, 54001, 70061, 70223, 70241, 70313, 71411, 72221, 73013, 73121, 74021, 74201, 75011, 76001, 80071, 80107, 80233, 80251, 80341, 80611, 80701 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There is no term that begins with 3, 6 or 9. - Bernard Schott, Feb 16 2020 LINKS Daniel Starodubtsev, Table of n, a(n) for n = 1..1000 EXAMPLE 4211 is a prime where the first digit equals the sum of all the other digits. MATHEMATICA ferQ[n_]:=Module[{idn=IntegerDigits[n]}, First[idn]==Total[Rest[idn]]]; Select[Prime[Range[8000]], ferQ] (* Harvey P. Dale, Jun 22 2011 *) CROSSREFS Cf. A000040. Sequence in context: A180406 A174884 A121402 * A057532 A193699 A001603 Adjacent sequences:  A156304 A156305 A156306 * A156308 A156309 A156310 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Feb 07 2009 EXTENSIONS Corrected and extended by Zak Seidov, Feb 08 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 3 16:20 EST 2020. Contains 338906 sequences. (Running on oeis4.)