The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A337148 Concatenation of sum n+(n+1) and product n*(n+1) in decimal. 0
 10, 32, 56, 712, 920, 1130, 1342, 1556, 1772, 1990, 21110, 23132, 25156, 27182, 29210, 31240, 33272, 35306, 37342, 39380, 41420, 43462, 45506, 47552, 49600, 51650, 53702, 55756, 57812, 59870, 61930, 63992, 651056, 671122, 691190, 711260, 731332, 751406, 771482 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..38. Eric Weisstein's World of Mathematics, Concatenation FORMULA a(n) = (2n+1)*10^b + n^2 + n, where b is length of n^2 + n. EXAMPLE For n = 0: n+1 = 1; 0+1 is 1 and 0*1 is 0. So concatenate to a(0) = 10. For n = 1: n+1 = 2; 1+2 is 3 and 1*2 is 2. So a(1) = 32. For n = 10: n+1 = 11; 10+11 is 21 and 10*11 is 110. So a(10) = 21110. MATHEMATICA Table[(2n+1)*10^Length[IntegerDigits[n^2+n]]+n^2+n, {n, 0, 38}] (* Stefano Spezia, Jan 29 2021 *) PROG (Python) def concatenate(n): return (2*n+1)*10**len(str(n**2+n))+ n**2+n CROSSREFS Cf. A002378, A005408. Sequence in context: A008422 A063926 A239834 * A202804 A155192 A229720 Adjacent sequences: A337145 A337146 A337147 * A337149 A337150 A337151 KEYWORD base,nonn AUTHOR Ercan Isik, Jan 27 2021 EXTENSIONS More terms from Stefano Spezia, Jan 29 2021 STATUS approved

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

Last modified December 8 16:32 EST 2023. Contains 367680 sequences. (Running on oeis4.)